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greg |
2.49 |
/* RCSid $Id: color.h,v 2.48 2024/08/14 20:05:23 greg Exp $ */
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greg |
1.1 |
/*
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greg |
2.38 |
* color.h - header for routines using pixel color and spectral values
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greg |
2.46 |
* (Notes by Randolph Fritz)
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greg |
1.1 |
*
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greg |
2.46 |
* COLOR REPRESENTATION OVERVIEW
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* =============================
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* Internally, Radiance represents light in multiple spectral
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* bands. Four spectral models are used: monochrome, RGB, XYZ,
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* and multiband.
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*
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* Units
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* -----
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* Radiance -- W/sr/m2
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* Irradiance -- W/m2
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* Luminance -- lm/sr/m2
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* Illuminance -- lm/m2
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*
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* Colors
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* ------
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* In the monochrome, RGB, and multiband formats, units of
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* radiance and irradiance are used. In the XYZ format, units
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* of luminance and illuminance are used, or sometimes an
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* intermediate form, where the units are multiplied by the
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* constant WHTEFFICACY, the scotopic luminous efficacy of
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* white light. WHTEFFICACY is 179, an approximation of the
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* luminous efficacy of the equal energy spectrum.
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*
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* In the multiband format, up to MAXCSAMP (by default 24)
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* spectral bands may be used. 24 was chosen after testing,
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* which found virtually no benefit for more than 18 bands. 24
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* was chosen to allow for additional infrared or ultraviolet
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* bands. If even that is not enough, MAXCSAMP can be increased
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* at compile time.
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*
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* Numbers
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* -------
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* Calculations are done using 32-bit floating point numbers.
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* Values are stored in the compressed real pixels[1] format,
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* which allocates one byte per band, plus one for an exponent.
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*
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* Real Pixel Format
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* -----------------
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* The real pixel format gives at most eight bits of floating
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* point precision to each spectral band; the brightest bands
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* have full precision, darker ones less.
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*
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* In the real pixel format, each spectral band is allotted a
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* one byte mantissa and a common single-byte exponent is used.
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* The exponent has the range [-128,127] and each mantissa is
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* assumed to have a binary point at the left, so they have the
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* range [0,255/256]. In addition, the mantissas are
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* normalized, so that at least one mantissa always is in the
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* range [128/256, 255/256] -- one mantissa will always have
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* its high-order bit set.
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*
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* References
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* ----------
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* [1] Ward, Greg. "Real Pixels." In Graphics Gems II, edited
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* by Arvo, James, 80--83. Graphics Gems Series. Boston:
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* Academic Press, 1991.
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*
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*
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* IMPLEMENTATION DETAILS
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* ======================
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greg |
1.1 |
* Two color representations are used, one for calculation and
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greg |
2.46 |
* another for storage. Calculation is done with an array of 32-bit
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* floats for speed. Stored color values use single byte mantissas
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* and a common exponent. By convention, types containing 32-bit
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* floats are denoted by COLOR and compressed types are denoted by
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* COLR. Tristimulus -- RGB or XYZ -- values can be stored in a
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* single 32-bit word.
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greg |
2.38 |
*
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* Spectral colors have between 3 and MAXCSAMP samples, and cover
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* wavelengths from WLPART[0] to WLPART[3] (max to min nanometers).
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* Wavelengths WLPART[1] and WLPART[2] mark the separation
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* of red/green and green/blue intervals, respectively.
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* The wavelength range may go well beyond visible in either
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* direction, but some routines will average over each interval
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* and designate the means as R, G, and B, regardless.
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* The number of samples is set in CNDX[3], and CNDX[0,1,2]
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* give peak wavelength indices corresponding to stdprims.
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* For best accuracy, internal calculations are promoted to
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* the current number of samples and final conversions
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* to tristimulus should use scolor_rgb() or scolor_cie().
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*
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greg |
2.46 |
* A Radiance file format is provided for spectral pictures, and
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* spectral colors must be converted by caller if the sampling
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* doesn't match.
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greg |
1.1 |
*/
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schorsch |
2.21 |
#ifndef _RAD_COLOR_H_
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#define _RAD_COLOR_H_
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schorsch |
2.25 |
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greg |
2.33 |
#include <stdio.h>
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schorsch |
2.25 |
#include <stdlib.h>
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greg |
2.38 |
#include <string.h>
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schorsch |
2.25 |
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schorsch |
2.21 |
#ifdef __cplusplus
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extern "C" {
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#endif
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greg |
2.18 |
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greg |
2.38 |
#ifndef MAXCSAMP
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#define MAXCSAMP 24 /* maximum # spectral samples */
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#endif
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greg |
2.46 |
/* Subscripts for tristimulus colors */
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greg |
1.1 |
#define RED 0
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#define GRN 1
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#define BLU 2
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greg |
2.10 |
#define CIEX 0 /* or, if input is XYZ... */
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#define CIEY 1
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#define CIEZ 2
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#define EXP 3 /* exponent same for either format */
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greg |
1.1 |
#define COLXS 128 /* excess used for exponent */
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greg |
2.10 |
#define WHT 3 /* used for RGBPRIMS type */
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greg |
1.1 |
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greg |
2.31 |
#undef uby8
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#define uby8 unsigned char /* 8-bit unsigned integer */
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greg |
1.1 |
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greg |
2.48 |
typedef uby8 COLRV;
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typedef COLRV COLR[4]; /* red, green, blue (or X,Y,Z), exponent */
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typedef COLRV SCOLR[MAXCSAMP+1]; /* spectral color, common exponent */
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greg |
1.1 |
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schorsch |
2.28 |
typedef float COLORV;
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typedef COLORV COLOR[3]; /* red, green, blue (or X,Y,Z) */
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greg |
2.38 |
typedef COLORV SCOLOR[MAXCSAMP]; /* spectral color */
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greg |
2.10 |
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typedef float RGBPRIMS[4][2]; /* (x,y) chromaticities for RGBW */
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typedef float (*RGBPRIMP)[2]; /* pointer to RGBPRIMS array */
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typedef float COLORMAT[3][3]; /* color coordinate conversion matrix */
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greg |
1.1 |
#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \
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c1[2]=c2[2],c1[3]=c2[3])
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greg |
2.38 |
#define colval(col,pri) (col)[pri]
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greg |
1.1 |
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#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b))
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greg |
2.38 |
#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf))
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#define opcolor(c1,op,c2) ((c1)[0]op(c2)[0],(c1)[1]op(c2)[1],(c1)[2]op(c2)[2])
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#define copycolor(c1,c2) opcolor(c1,=,c2)
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#define addcolor(c1,c2) opcolor(c1,+=,c2)
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#define multcolor(c1,c2) opcolor(c1,*=,c2)
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#define NCSAMP CNDX[EXP] /* current number of spectral samples */
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#define LSCOLR (NCSAMP+1)
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#define copyscolr(sc1,sc2) memcpy(sc1,sc2,LSCOLR)
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#define scolval(sc,pri) (sc)[CNDX[pri]]
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#define copyscolor(sc1,sc2) memcpy(sc1,sc2,sizeof(COLORV)*NCSAMP)
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#define scalescolor(sc,sf) {const float _f=sf; int _i=NCSAMP; \
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while (_i--) (sc)[_i] *= _f;}
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/* faster, use principal colors for RGB */
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#define pcolor_color(col,scol) setcolor(col,scolval(scol,RED),\
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scolval(scol,GRN),scolval(scol,BLU))
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#define pcolor_colr(clr,scol) setcolr(clr,scolval(scol,RED),\
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scolval(scol,GRN),scolval(scol,BLU))
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#define sopscolor(sc1,op,sc2) {int _i=NCSAMP; while (_i--) (sc1)[_i] op (sc2)[_i];}
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#define saddscolor(sc1,sc2) sopscolor(sc1,+=,sc2)
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#define smultscolor(sc1,sc2) sopscolor(sc1,*=,sc2)
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#define scolrblack(c) memset(c,0,LSCOLR)
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greg |
1.1 |
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greg |
2.44 |
#define scolorblack(c) memset(c,0,sizeof(COLORV)*NCSAMP)
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greg |
2.38 |
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#define scolor_color(col,scol) scolor2color(col,scol,NCSAMP,WLPART)
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#define scolor_colr(clr,scol) scolor2colr(clr,scol,NCSAMP,WLPART)
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#define scolor_scolr(sclr,scol) scolor2scolr(sclr,scol,NCSAMP)
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#define scolr_scolor(scol,sclr) scolr2scolor(scol,sclr,NCSAMP)
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#define scolr_color(col,sclr) scolr2color(col,sclr,NCSAMP,WLPART)
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#define sopcolor(sc1,op,c2) {SCOLOR _sct;\
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greg |
2.42 |
setscolor(_sct,(c2)[RED],(c2)[GRN],(c2)[BLU]);\
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greg |
2.38 |
sopscolor(sc1,op,_sct);}
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#define saddcolor(sc1,c2) sopcolor(sc1,+=,c2)
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#define smultcolor(sc1,c2) sopcolor(sc1,*=,c2)
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#define opscolor(c1,op,sc2) {COLOR _ct; scolor_color(_ct,sc2);\
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opcolor(c1,op,_ct);}
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greg |
1.1 |
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greg |
2.38 |
#define addscolor(c1,sc2) opscolor(c1,+=,sc2)
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greg |
1.1 |
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greg |
2.38 |
#define multscolor(c1,sc2) opscolor(c1,*=,sc2)
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greg |
1.1 |
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greg |
2.35 |
#if defined(NTSC_RGB)
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greg |
2.7 |
#define CIE_x_r 0.670 /* standard NTSC primaries */
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#define CIE_y_r 0.330
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#define CIE_x_g 0.210
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#define CIE_y_g 0.710
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#define CIE_x_b 0.140
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#define CIE_y_b 0.080
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greg |
2.35 |
#define CIE_x_w (1./3.) /* use EE white */
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#define CIE_y_w (1./3.)
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#elif defined(SHARP_RGB)
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#define CIE_x_r 0.6898 /* "sharp" RGB primaries */
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#define CIE_y_r 0.3206
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#define CIE_x_g 0.0736
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#define CIE_y_g 0.9003
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#define CIE_x_b 0.1166
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#define CIE_y_b 0.0374
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#define CIE_x_w (1./3.) /* use EE white */
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greg |
2.34 |
#define CIE_y_w (1./3.)
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greg |
1.7 |
#else
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greg |
2.7 |
#define CIE_x_r 0.640 /* nominal CRT primaries */
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#define CIE_y_r 0.330
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#define CIE_x_g 0.290
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#define CIE_y_g 0.600
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#define CIE_x_b 0.150
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#define CIE_y_b 0.060
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greg |
2.35 |
#define CIE_x_w (1./3.) /* use EE white */
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greg |
2.34 |
#define CIE_y_w (1./3.)
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greg |
1.7 |
#endif
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greg |
2.7 |
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greg |
2.14 |
#define STDPRIMS {{CIE_x_r,CIE_y_r},{CIE_x_g,CIE_y_g}, \
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{CIE_x_b,CIE_y_b},{CIE_x_w,CIE_y_w}}
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| 230 |
greg |
2.10 |
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greg |
2.7 |
#define CIE_D ( CIE_x_r*(CIE_y_g - CIE_y_b) + \
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CIE_x_g*(CIE_y_b - CIE_y_r) + \
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CIE_x_b*(CIE_y_r - CIE_y_g) )
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| 234 |
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#define CIE_C_rD ( (1./CIE_y_w) * \
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| 235 |
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( CIE_x_w*(CIE_y_g - CIE_y_b) - \
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CIE_y_w*(CIE_x_g - CIE_x_b) + \
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CIE_x_g*CIE_y_b - CIE_x_b*CIE_y_g ) )
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| 238 |
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#define CIE_C_gD ( (1./CIE_y_w) * \
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| 239 |
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( CIE_x_w*(CIE_y_b - CIE_y_r) - \
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| 240 |
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CIE_y_w*(CIE_x_b - CIE_x_r) - \
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| 241 |
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CIE_x_r*CIE_y_b + CIE_x_b*CIE_y_r ) )
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| 242 |
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#define CIE_C_bD ( (1./CIE_y_w) * \
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| 243 |
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( CIE_x_w*(CIE_y_r - CIE_y_g) - \
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| 244 |
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CIE_y_w*(CIE_x_r - CIE_x_g) + \
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| 245 |
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CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r ) )
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| 246 |
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| 247 |
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#define CIE_rf (CIE_y_r*CIE_C_rD/CIE_D)
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| 248 |
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#define CIE_gf (CIE_y_g*CIE_C_gD/CIE_D)
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| 249 |
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#define CIE_bf (CIE_y_b*CIE_C_bD/CIE_D)
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| 250 |
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greg |
2.35 |
/* Default CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */
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| 252 |
greg |
2.9 |
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| 253 |
greg |
2.38 |
/***** The following definitions are not for XYZ colors *****/
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| 254 |
greg |
2.10 |
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| 255 |
greg |
2.7 |
#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU])
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| 256 |
greg |
2.38 |
#define pbright(col) (CIE_rf*scolval(col,RED) + CIE_gf*scolval(col,GRN) + \
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| 257 |
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CIE_bf*scolval(col,BLU))
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| 258 |
greg |
2.7 |
#define normbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[RED] + \
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| 259 |
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(long)(CIE_gf*256.+.5)*(c)[GRN] + \
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| 260 |
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(long)(CIE_bf*256.+.5)*(c)[BLU] ) >> 8 )
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| 261 |
greg |
2.38 |
#define normpbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[CNDX[RED]] + \
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| 262 |
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(long)(CIE_gf*256.+.5)*(c)[CNDX[GRN]] + \
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| 263 |
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(long)(CIE_bf*256.+.5)*(c)[CNDX[BLU]] ) >> 8 )
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| 264 |
greg |
1.1 |
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| 265 |
greg |
1.14 |
/* luminous efficacies over visible spectrum */
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| 266 |
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#define MAXEFFICACY 683. /* defined maximum at 550 nm */
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| 267 |
greg |
2.38 |
#define WHTEFFICACY 179. /* equal energy white 380-780nm */
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| 268 |
greg |
1.14 |
#define D65EFFICACY 203. /* standard illuminant D65 */
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| 269 |
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#define INCEFFICACY 160. /* illuminant A (incand.) */
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| 270 |
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#define SUNEFFICACY 208. /* illuminant B (solar dir.) */
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| 271 |
greg |
2.27 |
#define SKYEFFICACY D65EFFICACY /* skylight (should be 110) */
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| 272 |
greg |
1.14 |
#define DAYEFFICACY D65EFFICACY /* combined sky and solar */
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| 273 |
greg |
2.38 |
#define WHTSCOTOPIC 412. /* scotopic EE white 380-780nm */
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| 274 |
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#define WHTMELANOPIC 179. /* melanopic EE white 380-780nm */
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| 275 |
greg |
1.14 |
|
| 276 |
|
|
#define luminance(col) (WHTEFFICACY * bright(col))
|
| 277 |
greg |
2.38 |
#define pluminance(scol) (WHTEFFICACY * pbright(scol))
|
| 278 |
|
|
|
| 279 |
|
|
#define scolor_rgb(col,scol) scolor2rgb(col,scol,NCSAMP,WLPART)
|
| 280 |
greg |
1.9 |
|
| 281 |
greg |
2.10 |
/***** ...end of stuff specific to RGB colors *****/
|
| 282 |
|
|
|
| 283 |
greg |
2.38 |
#define scolor_cie(col,scol) scolor2cie(col,scol,NCSAMP,WLPART)
|
| 284 |
|
|
|
| 285 |
|
|
#define sluminance(scol) (WHTEFFICACY * scolor_photopic(scol))
|
| 286 |
|
|
|
| 287 |
greg |
1.1 |
#define intens(col) ( (col)[0] > (col)[1] \
|
| 288 |
|
|
? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \
|
| 289 |
|
|
: (col)[1] > (col)[2] ? (col)[1] : (col)[2] )
|
| 290 |
|
|
|
| 291 |
greg |
1.3 |
#define colrval(c,p) ( (c)[EXP] ? \
|
| 292 |
|
|
ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \
|
| 293 |
|
|
0. )
|
| 294 |
|
|
|
| 295 |
greg |
2.38 |
#define scolrval(c,p) ( (c)[CNDX[EXP]] ? \
|
| 296 |
|
|
ldexp((c)[CNDX[p]]+.5,(int)(c)[CNDX[EXP]]-(COLXS+8)) : \
|
| 297 |
|
|
0. )
|
| 298 |
|
|
|
| 299 |
greg |
1.1 |
#define WHTCOLOR {1.0,1.0,1.0}
|
| 300 |
|
|
#define BLKCOLOR {0.0,0.0,0.0}
|
| 301 |
|
|
#define WHTCOLR {128,128,128,COLXS+1}
|
| 302 |
|
|
#define BLKCOLR {0,0,0,0}
|
| 303 |
greg |
1.3 |
|
| 304 |
greg |
1.11 |
/* picture format identifier */
|
| 305 |
|
|
#define COLRFMT "32-bit_rle_rgbe"
|
| 306 |
greg |
2.10 |
#define CIEFMT "32-bit_rle_xyze"
|
| 307 |
|
|
#define PICFMT "32-bit_rle_???e" /* matches either */
|
| 308 |
greg |
2.40 |
#define SPECFMT "Radiance_spectra" /* spectral data w/ exponent */
|
| 309 |
greg |
2.38 |
|
| 310 |
|
|
/* Number of spectral components */
|
| 311 |
|
|
#define NCOMPSTR "NCOMP="
|
| 312 |
|
|
#define LNCOMPSTR 6
|
| 313 |
greg |
2.43 |
#define isncomp(hl) !strncmp(hl,NCOMPSTR,LNCOMPSTR)
|
| 314 |
greg |
2.38 |
#define ncompval(hl) atoi((hl)+LNCOMPSTR)
|
| 315 |
|
|
#define fputncomp(nc,fp) fprintf(fp,"%s%d\n",NCOMPSTR,nc)
|
| 316 |
|
|
|
| 317 |
|
|
/* 4 wavelength partitions for (IR+)R,G,B(+UV) */
|
| 318 |
|
|
#define WLSPLTSTR "WAVELENGTH_SPLITS="
|
| 319 |
|
|
#define LWLSPLTSTR 18
|
| 320 |
greg |
2.43 |
#define iswlsplit(hl) !strncmp(hl,WLSPLTSTR,LWLSPLTSTR)
|
| 321 |
greg |
2.38 |
#define wlsplitval(w,hl) (sscanf((hl)+LWLSPLTSTR,"%f %f %f %f",\
|
| 322 |
|
|
&(w)[0],&(w)[1],&(w)[2],&(w)[3]) == 4)
|
| 323 |
greg |
2.39 |
#define fputwlsplit(w,fp) fprintf(fp,"%s %g %g %g %g\n",WLSPLTSTR,\
|
| 324 |
greg |
2.38 |
(w)[0],(w)[1],(w)[2],(w)[3])
|
| 325 |
greg |
1.11 |
|
| 326 |
greg |
1.6 |
/* macros for exposures */
|
| 327 |
greg |
1.5 |
#define EXPOSSTR "EXPOSURE="
|
| 328 |
greg |
1.12 |
#define LEXPOSSTR 9
|
| 329 |
greg |
2.43 |
#define isexpos(hl) !strncmp(hl,EXPOSSTR,LEXPOSSTR)
|
| 330 |
greg |
1.12 |
#define exposval(hl) atof((hl)+LEXPOSSTR)
|
| 331 |
greg |
2.37 |
#define fputexpos(ex,fp) fprintf(fp,"%s%.4e\n",EXPOSSTR,ex)
|
| 332 |
greg |
1.6 |
|
| 333 |
|
|
/* macros for pixel aspect ratios */
|
| 334 |
|
|
#define ASPECTSTR "PIXASPECT="
|
| 335 |
greg |
1.12 |
#define LASPECTSTR 10
|
| 336 |
greg |
2.43 |
#define isaspect(hl) !strncmp(hl,ASPECTSTR,LASPECTSTR)
|
| 337 |
greg |
1.12 |
#define aspectval(hl) atof((hl)+LASPECTSTR)
|
| 338 |
greg |
1.6 |
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa)
|
| 339 |
greg |
1.5 |
|
| 340 |
greg |
2.10 |
/* macros for primary specifications */
|
| 341 |
|
|
#define PRIMARYSTR "PRIMARIES="
|
| 342 |
|
|
#define LPRIMARYSTR 10
|
| 343 |
greg |
2.43 |
#define isprims(hl) !strncmp(hl,PRIMARYSTR,LPRIMARYSTR)
|
| 344 |
greg |
2.32 |
#define primsval(p,hl) (sscanf((hl)+LPRIMARYSTR, \
|
| 345 |
greg |
2.10 |
"%f %f %f %f %f %f %f %f", \
|
| 346 |
|
|
&(p)[RED][CIEX],&(p)[RED][CIEY], \
|
| 347 |
|
|
&(p)[GRN][CIEX],&(p)[GRN][CIEY], \
|
| 348 |
|
|
&(p)[BLU][CIEX],&(p)[BLU][CIEY], \
|
| 349 |
greg |
2.32 |
&(p)[WHT][CIEX],&(p)[WHT][CIEY]) == 8)
|
| 350 |
greg |
2.10 |
#define fputprims(p,fp) fprintf(fp, \
|
| 351 |
|
|
"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\
|
| 352 |
|
|
PRIMARYSTR, \
|
| 353 |
|
|
(p)[RED][CIEX],(p)[RED][CIEY], \
|
| 354 |
|
|
(p)[GRN][CIEX],(p)[GRN][CIEY], \
|
| 355 |
|
|
(p)[BLU][CIEX],(p)[BLU][CIEY], \
|
| 356 |
|
|
(p)[WHT][CIEX],(p)[WHT][CIEY])
|
| 357 |
|
|
|
| 358 |
greg |
1.8 |
/* macros for color correction */
|
| 359 |
|
|
#define COLCORSTR "COLORCORR="
|
| 360 |
greg |
1.12 |
#define LCOLCORSTR 10
|
| 361 |
greg |
2.43 |
#define iscolcor(hl) !strncmp(hl,COLCORSTR,LCOLCORSTR)
|
| 362 |
greg |
2.30 |
#define colcorval(cc,hl) sscanf((hl)+LCOLCORSTR,"%f %f %f", \
|
| 363 |
greg |
1.8 |
&(cc)[RED],&(cc)[GRN],&(cc)[BLU])
|
| 364 |
|
|
#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \
|
| 365 |
|
|
(cc)[RED],(cc)[GRN],(cc)[BLU])
|
| 366 |
greg |
2.6 |
|
| 367 |
greg |
2.10 |
/*
|
| 368 |
|
|
* Conversions to and from XYZ space generally don't apply WHTEFFICACY.
|
| 369 |
|
|
* If you need Y to be luminance (cd/m^2), this must be applied when
|
| 370 |
|
|
* converting from radiance (watts/sr/m^2).
|
| 371 |
|
|
*/
|
| 372 |
|
|
|
| 373 |
greg |
2.38 |
extern int CNDX[4]; /* RGBE indices for SCOLOR, SCOLR */
|
| 374 |
|
|
extern float WLPART[4]; /* RGB wavelength limits+partitions (nm) */
|
| 375 |
greg |
2.18 |
extern RGBPRIMS stdprims; /* standard primary chromaticities */
|
| 376 |
greg |
2.38 |
extern RGBPRIMS xyzprims; /* to indicate XYZ input or output */
|
| 377 |
greg |
2.18 |
extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */
|
| 378 |
|
|
extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */
|
| 379 |
greg |
2.49 |
extern const COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */
|
| 380 |
|
|
extern const SCOLOR scblack; /* black spectral color (all 0's) */
|
| 381 |
greg |
2.10 |
|
| 382 |
greg |
2.13 |
#define CGAMUT_LOWER 01
|
| 383 |
|
|
#define CGAMUT_UPPER 02
|
| 384 |
|
|
#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER)
|
| 385 |
|
|
|
| 386 |
|
|
#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb)
|
| 387 |
greg |
2.10 |
|
| 388 |
greg |
2.20 |
#define cpcolormat(md,ms) memcpy((void *)md,(void *)ms,sizeof(COLORMAT))
|
| 389 |
greg |
2.18 |
|
| 390 |
|
|
/* defined in color.c */
|
| 391 |
greg |
2.38 |
extern void *tempbuffer(size_t len);
|
| 392 |
|
|
/* in cn[3]=nsamps, wlpt[0],wlpt[3]=extrema */
|
| 393 |
|
|
extern int setspectrsamp(int cn[4], float wlpt[4]);
|
| 394 |
greg |
2.18 |
extern int fwritecolrs(COLR *scanline, int len, FILE *fp);
|
| 395 |
greg |
2.38 |
extern int fwritescan(COLOR *scanline, int len, FILE *fp);
|
| 396 |
greg |
2.48 |
extern int fwritescolrs(const COLRV *sscanline, int nc, int len, FILE *fp);
|
| 397 |
|
|
extern int fwritesscan(const COLORV *sscanline, int nc, int len, FILE *fp);
|
| 398 |
greg |
2.18 |
extern int freadcolrs(COLR *scanline, int len, FILE *fp);
|
| 399 |
|
|
extern int freadscan(COLOR *scanline, int len, FILE *fp);
|
| 400 |
greg |
2.48 |
extern int freadscolrs(COLRV *scanline, int nc, int len, FILE *fp);
|
| 401 |
greg |
2.38 |
extern int freadsscan(COLORV *sscanline, int nc, int len, FILE *fp);
|
| 402 |
|
|
/* spectrum conversion, zero-fill past ends */
|
| 403 |
|
|
extern void convertscolor(SCOLOR dst, int dnc, double dwl0, double dwl1,
|
| 404 |
|
|
const COLORV src[], int snc, double swl0, double swl1);
|
| 405 |
|
|
/* the following use avg spectral ranges */
|
| 406 |
|
|
/* compare scolor_rgb() and scolor_cie() */
|
| 407 |
|
|
/* also, pcolor_color() and pcolor_colr() */
|
| 408 |
|
|
extern void setscolor(SCOLOR scol, double r, double g, double b);
|
| 409 |
greg |
2.48 |
extern void scolor2color(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 410 |
|
|
extern void scolor2colr(COLR clr, const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 411 |
|
|
extern void scolor2scolr(SCOLR sclr, const SCOLOR scol, int ncs);
|
| 412 |
|
|
extern void colr_color(COLOR col, const COLR clr);
|
| 413 |
|
|
extern void scolr2scolor(SCOLOR scol, const SCOLR sclr, int ncs);
|
| 414 |
|
|
extern void scolr2color(COLOR col, const SCOLR sclr, int ncs, const float wlpt[4]);
|
| 415 |
greg |
2.18 |
extern void setcolr(COLR clr, double r, double g, double b);
|
| 416 |
greg |
2.38 |
extern void setscolr(SCOLR sclr, double r, double g, double b);
|
| 417 |
greg |
2.48 |
extern double scolor_mean(const SCOLOR scol);
|
| 418 |
|
|
extern double sintens(const SCOLOR scol);
|
| 419 |
|
|
extern int bigdiff(const COLOR c1, const COLOR c2, double md);
|
| 420 |
|
|
extern int sbigsdiff(const SCOLOR sc1, const SCOLOR sc2, double md);
|
| 421 |
greg |
2.18 |
/* defined in spec_rgb.c */
|
| 422 |
greg |
2.48 |
extern void scolor_out(COLORV *cout, RGBPRIMS pr, const SCOLOR cres);
|
| 423 |
greg |
2.38 |
extern void spec_cie(COLOR col, int s, int e);
|
| 424 |
greg |
2.18 |
extern void spec_rgb(COLOR col, int s, int e);
|
| 425 |
greg |
2.48 |
extern void cie_rgb(COLOR rgb, const COLOR xyz);
|
| 426 |
greg |
2.18 |
extern int clipgamut(COLOR col, double brt, int gamut,
|
| 427 |
greg |
2.48 |
const COLOR lower, const COLOR upper);
|
| 428 |
|
|
extern void colortrans(COLOR c2, const COLORMAT mat, const COLOR c1);
|
| 429 |
|
|
extern void multcolormat(COLORMAT m3, const COLORMAT m2,
|
| 430 |
|
|
const COLORMAT m1);
|
| 431 |
greg |
2.29 |
extern int colorprimsOK(RGBPRIMS pr);
|
| 432 |
|
|
extern int compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr);
|
| 433 |
|
|
extern int comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr);
|
| 434 |
|
|
extern int comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2);
|
| 435 |
greg |
2.48 |
extern int compxyzWBmat(COLORMAT mat, const float wht1[2], const float wht2[2]);
|
| 436 |
greg |
2.29 |
extern int compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr);
|
| 437 |
|
|
extern int comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr);
|
| 438 |
|
|
extern int comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2);
|
| 439 |
greg |
2.45 |
/* any uniform spectrum to working */
|
| 440 |
|
|
extern void convertscolorcol(SCOLOR rcol, const COLORV src[], int snc,
|
| 441 |
|
|
double swl0, double swl1);
|
| 442 |
greg |
2.38 |
/* most accurate spectral->tristim */
|
| 443 |
greg |
2.48 |
extern void scolor2cie(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 444 |
|
|
extern void scolor2rgb(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 445 |
|
|
extern double scolor2photopic(const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 446 |
|
|
extern double scolor2scotopic(const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 447 |
|
|
extern double scolor2melanopic(const SCOLOR scol, int ncs, const float wlpt[4]);
|
| 448 |
|
|
extern double scolor_photopic(const SCOLOR scol);
|
| 449 |
|
|
extern double scolor_scotopic(const SCOLOR scol);
|
| 450 |
|
|
extern double scolor_melanopic(const SCOLOR scol);
|
| 451 |
greg |
2.18 |
/* defined in colrops.c */
|
| 452 |
schorsch |
2.26 |
extern int setcolrcor(double (*f)(double, double), double a2);
|
| 453 |
|
|
extern int setcolrinv(double (*f)(double, double), double a2);
|
| 454 |
greg |
2.18 |
extern int setcolrgam(double g);
|
| 455 |
|
|
extern int colrs_gambs(COLR *scan, int len);
|
| 456 |
|
|
extern int gambs_colrs(COLR *scan, int len);
|
| 457 |
|
|
extern void shiftcolrs(COLR *scan, int len, int adjust);
|
| 458 |
|
|
extern void normcolrs(COLR *scan, int len, int adjust);
|
| 459 |
|
|
|
| 460 |
|
|
#ifdef __cplusplus
|
| 461 |
|
|
}
|
| 462 |
greg |
2.6 |
#endif
|
| 463 |
schorsch |
2.21 |
#endif /* _RAD_COLOR_H_ */
|
| 464 |
|
|
|
