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greg |
2.52 |
/* RCSid $Id: color.h,v 2.51 2024/10/29 00:35:06 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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greg |
2.52 |
#define cx2real(m,e) (((m)+.5f)*cxponent[e]) |
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greg |
2.38 |
#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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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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#define CIE_C_rD ( (1./CIE_y_w) * \ |
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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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#define CIE_C_gD ( (1./CIE_y_w) * \ |
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( CIE_x_w*(CIE_y_b - CIE_y_r) - \ |
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CIE_y_w*(CIE_x_b - CIE_x_r) - \ |
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CIE_x_r*CIE_y_b + CIE_x_b*CIE_y_r ) ) |
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#define CIE_C_bD ( (1./CIE_y_w) * \ |
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( CIE_x_w*(CIE_y_r - CIE_y_g) - \ |
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CIE_y_w*(CIE_x_r - CIE_x_g) + \ |
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CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r ) ) |
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#define CIE_rf (CIE_y_r*CIE_C_rD/CIE_D) |
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#define CIE_gf (CIE_y_g*CIE_C_gD/CIE_D) |
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#define CIE_bf (CIE_y_b*CIE_C_bD/CIE_D) |
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greg |
2.35 |
/* Default CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */ |
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greg |
2.9 |
|
| 255 |
greg |
2.38 |
/***** The following definitions are not for XYZ colors *****/ |
| 256 |
greg |
2.10 |
|
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greg |
2.7 |
#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU]) |
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greg |
2.38 |
#define pbright(col) (CIE_rf*scolval(col,RED) + CIE_gf*scolval(col,GRN) + \ |
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CIE_bf*scolval(col,BLU)) |
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greg |
2.7 |
#define normbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[RED] + \ |
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(long)(CIE_gf*256.+.5)*(c)[GRN] + \ |
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(long)(CIE_bf*256.+.5)*(c)[BLU] ) >> 8 ) |
| 263 |
greg |
2.38 |
#define normpbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[CNDX[RED]] + \ |
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(long)(CIE_gf*256.+.5)*(c)[CNDX[GRN]] + \ |
| 265 |
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(long)(CIE_bf*256.+.5)*(c)[CNDX[BLU]] ) >> 8 ) |
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greg |
1.1 |
|
| 267 |
greg |
1.14 |
/* luminous efficacies over visible spectrum */ |
| 268 |
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#define MAXEFFICACY 683. /* defined maximum at 550 nm */ |
| 269 |
greg |
2.38 |
#define WHTEFFICACY 179. /* equal energy white 380-780nm */ |
| 270 |
greg |
1.14 |
#define D65EFFICACY 203. /* standard illuminant D65 */ |
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#define INCEFFICACY 160. /* illuminant A (incand.) */ |
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#define SUNEFFICACY 208. /* illuminant B (solar dir.) */ |
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greg |
2.27 |
#define SKYEFFICACY D65EFFICACY /* skylight (should be 110) */ |
| 274 |
greg |
1.14 |
#define DAYEFFICACY D65EFFICACY /* combined sky and solar */ |
| 275 |
greg |
2.38 |
#define WHTSCOTOPIC 412. /* scotopic EE white 380-780nm */ |
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#define WHTMELANOPIC 179. /* melanopic EE white 380-780nm */ |
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greg |
1.14 |
|
| 278 |
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#define luminance(col) (WHTEFFICACY * bright(col)) |
| 279 |
greg |
2.38 |
#define pluminance(scol) (WHTEFFICACY * pbright(scol)) |
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| 281 |
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#define scolor_rgb(col,scol) scolor2rgb(col,scol,NCSAMP,WLPART) |
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greg |
1.9 |
|
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greg |
2.10 |
/***** ...end of stuff specific to RGB colors *****/ |
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| 285 |
greg |
2.38 |
#define scolor_cie(col,scol) scolor2cie(col,scol,NCSAMP,WLPART) |
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| 287 |
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#define sluminance(scol) (WHTEFFICACY * scolor_photopic(scol)) |
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| 289 |
greg |
1.1 |
#define intens(col) ( (col)[0] > (col)[1] \ |
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? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \ |
| 291 |
|
|
: (col)[1] > (col)[2] ? (col)[1] : (col)[2] ) |
| 292 |
|
|
|
| 293 |
greg |
2.52 |
#define colrval(c,p) cx2real((c)[p],(c)[EXP]) |
| 294 |
|
|
|
| 295 |
|
|
#define scolrval(c,p) cx2real((c)[CNDX[p]],(c)[CNDX[EXP]]) |
| 296 |
greg |
2.38 |
|
| 297 |
greg |
1.1 |
#define WHTCOLOR {1.0,1.0,1.0} |
| 298 |
|
|
#define BLKCOLOR {0.0,0.0,0.0} |
| 299 |
|
|
#define WHTCOLR {128,128,128,COLXS+1} |
| 300 |
|
|
#define BLKCOLR {0,0,0,0} |
| 301 |
greg |
1.3 |
|
| 302 |
greg |
1.11 |
/* picture format identifier */ |
| 303 |
|
|
#define COLRFMT "32-bit_rle_rgbe" |
| 304 |
greg |
2.10 |
#define CIEFMT "32-bit_rle_xyze" |
| 305 |
|
|
#define PICFMT "32-bit_rle_???e" /* matches either */ |
| 306 |
greg |
2.40 |
#define SPECFMT "Radiance_spectra" /* spectral data w/ exponent */ |
| 307 |
greg |
2.38 |
|
| 308 |
|
|
/* Number of spectral components */ |
| 309 |
|
|
#define NCOMPSTR "NCOMP=" |
| 310 |
|
|
#define LNCOMPSTR 6 |
| 311 |
greg |
2.43 |
#define isncomp(hl) !strncmp(hl,NCOMPSTR,LNCOMPSTR) |
| 312 |
greg |
2.38 |
#define ncompval(hl) atoi((hl)+LNCOMPSTR) |
| 313 |
|
|
#define fputncomp(nc,fp) fprintf(fp,"%s%d\n",NCOMPSTR,nc) |
| 314 |
|
|
|
| 315 |
|
|
/* 4 wavelength partitions for (IR+)R,G,B(+UV) */ |
| 316 |
|
|
#define WLSPLTSTR "WAVELENGTH_SPLITS=" |
| 317 |
|
|
#define LWLSPLTSTR 18 |
| 318 |
greg |
2.43 |
#define iswlsplit(hl) !strncmp(hl,WLSPLTSTR,LWLSPLTSTR) |
| 319 |
greg |
2.38 |
#define wlsplitval(w,hl) (sscanf((hl)+LWLSPLTSTR,"%f %f %f %f",\ |
| 320 |
|
|
&(w)[0],&(w)[1],&(w)[2],&(w)[3]) == 4) |
| 321 |
greg |
2.39 |
#define fputwlsplit(w,fp) fprintf(fp,"%s %g %g %g %g\n",WLSPLTSTR,\ |
| 322 |
greg |
2.38 |
(w)[0],(w)[1],(w)[2],(w)[3]) |
| 323 |
greg |
1.11 |
|
| 324 |
greg |
1.6 |
/* macros for exposures */ |
| 325 |
greg |
1.5 |
#define EXPOSSTR "EXPOSURE=" |
| 326 |
greg |
1.12 |
#define LEXPOSSTR 9 |
| 327 |
greg |
2.43 |
#define isexpos(hl) !strncmp(hl,EXPOSSTR,LEXPOSSTR) |
| 328 |
greg |
1.12 |
#define exposval(hl) atof((hl)+LEXPOSSTR) |
| 329 |
greg |
2.37 |
#define fputexpos(ex,fp) fprintf(fp,"%s%.4e\n",EXPOSSTR,ex) |
| 330 |
greg |
1.6 |
|
| 331 |
|
|
/* macros for pixel aspect ratios */ |
| 332 |
|
|
#define ASPECTSTR "PIXASPECT=" |
| 333 |
greg |
1.12 |
#define LASPECTSTR 10 |
| 334 |
greg |
2.43 |
#define isaspect(hl) !strncmp(hl,ASPECTSTR,LASPECTSTR) |
| 335 |
greg |
1.12 |
#define aspectval(hl) atof((hl)+LASPECTSTR) |
| 336 |
greg |
1.6 |
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa) |
| 337 |
greg |
1.5 |
|
| 338 |
greg |
2.10 |
/* macros for primary specifications */ |
| 339 |
|
|
#define PRIMARYSTR "PRIMARIES=" |
| 340 |
|
|
#define LPRIMARYSTR 10 |
| 341 |
greg |
2.43 |
#define isprims(hl) !strncmp(hl,PRIMARYSTR,LPRIMARYSTR) |
| 342 |
greg |
2.32 |
#define primsval(p,hl) (sscanf((hl)+LPRIMARYSTR, \ |
| 343 |
greg |
2.10 |
"%f %f %f %f %f %f %f %f", \ |
| 344 |
|
|
&(p)[RED][CIEX],&(p)[RED][CIEY], \ |
| 345 |
|
|
&(p)[GRN][CIEX],&(p)[GRN][CIEY], \ |
| 346 |
|
|
&(p)[BLU][CIEX],&(p)[BLU][CIEY], \ |
| 347 |
greg |
2.32 |
&(p)[WHT][CIEX],&(p)[WHT][CIEY]) == 8) |
| 348 |
greg |
2.10 |
#define fputprims(p,fp) fprintf(fp, \ |
| 349 |
|
|
"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\ |
| 350 |
|
|
PRIMARYSTR, \ |
| 351 |
|
|
(p)[RED][CIEX],(p)[RED][CIEY], \ |
| 352 |
|
|
(p)[GRN][CIEX],(p)[GRN][CIEY], \ |
| 353 |
|
|
(p)[BLU][CIEX],(p)[BLU][CIEY], \ |
| 354 |
|
|
(p)[WHT][CIEX],(p)[WHT][CIEY]) |
| 355 |
|
|
|
| 356 |
greg |
1.8 |
/* macros for color correction */ |
| 357 |
|
|
#define COLCORSTR "COLORCORR=" |
| 358 |
greg |
1.12 |
#define LCOLCORSTR 10 |
| 359 |
greg |
2.43 |
#define iscolcor(hl) !strncmp(hl,COLCORSTR,LCOLCORSTR) |
| 360 |
greg |
2.51 |
#define colcorval(cc,hl) (sscanf((hl)+LCOLCORSTR,"%f %f %f", \ |
| 361 |
|
|
&(cc)[RED],&(cc)[GRN],&(cc)[BLU]) == 3) |
| 362 |
greg |
1.8 |
#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \ |
| 363 |
|
|
(cc)[RED],(cc)[GRN],(cc)[BLU]) |
| 364 |
greg |
2.6 |
|
| 365 |
greg |
2.10 |
/* |
| 366 |
|
|
* Conversions to and from XYZ space generally don't apply WHTEFFICACY. |
| 367 |
|
|
* If you need Y to be luminance (cd/m^2), this must be applied when |
| 368 |
|
|
* converting from radiance (watts/sr/m^2). |
| 369 |
|
|
*/ |
| 370 |
|
|
|
| 371 |
greg |
2.52 |
extern const float cxponent[256]; /* exponent look-up */ |
| 372 |
greg |
2.38 |
extern int CNDX[4]; /* RGBE indices for SCOLOR, SCOLR */ |
| 373 |
|
|
extern float WLPART[4]; /* RGB wavelength limits+partitions (nm) */ |
| 374 |
greg |
2.18 |
extern RGBPRIMS stdprims; /* standard primary chromaticities */ |
| 375 |
greg |
2.38 |
extern RGBPRIMS xyzprims; /* to indicate XYZ input or output */ |
| 376 |
greg |
2.18 |
extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */ |
| 377 |
|
|
extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */ |
| 378 |
greg |
2.49 |
extern const COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */ |
| 379 |
|
|
extern const SCOLOR scblack; /* black spectral color (all 0's) */ |
| 380 |
greg |
2.10 |
|
| 381 |
greg |
2.13 |
#define CGAMUT_LOWER 01 |
| 382 |
|
|
#define CGAMUT_UPPER 02 |
| 383 |
|
|
#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER) |
| 384 |
|
|
|
| 385 |
|
|
#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb) |
| 386 |
greg |
2.10 |
|
| 387 |
greg |
2.20 |
#define cpcolormat(md,ms) memcpy((void *)md,(void *)ms,sizeof(COLORMAT)) |
| 388 |
greg |
2.18 |
|
| 389 |
greg |
2.52 |
#define colr_color(col,clr) ((col)[RED]=colrval(clr,RED),\ |
| 390 |
|
|
(col)[GRN]=colrval(clr,GRN),\ |
| 391 |
|
|
(col)[BLU]=colrval(clr,BLU)) |
| 392 |
|
|
|
| 393 |
greg |
2.18 |
/* defined in color.c */ |
| 394 |
greg |
2.38 |
extern void *tempbuffer(size_t len); |
| 395 |
|
|
/* in cn[3]=nsamps, wlpt[0],wlpt[3]=extrema */ |
| 396 |
|
|
extern int setspectrsamp(int cn[4], float wlpt[4]); |
| 397 |
greg |
2.18 |
extern int fwritecolrs(COLR *scanline, int len, FILE *fp); |
| 398 |
greg |
2.38 |
extern int fwritescan(COLOR *scanline, int len, FILE *fp); |
| 399 |
greg |
2.48 |
extern int fwritescolrs(const COLRV *sscanline, int nc, int len, FILE *fp); |
| 400 |
|
|
extern int fwritesscan(const COLORV *sscanline, int nc, int len, FILE *fp); |
| 401 |
greg |
2.18 |
extern int freadcolrs(COLR *scanline, int len, FILE *fp); |
| 402 |
|
|
extern int freadscan(COLOR *scanline, int len, FILE *fp); |
| 403 |
greg |
2.48 |
extern int freadscolrs(COLRV *scanline, int nc, int len, FILE *fp); |
| 404 |
greg |
2.38 |
extern int freadsscan(COLORV *sscanline, int nc, int len, FILE *fp); |
| 405 |
greg |
2.50 |
extern int fread2colrs(COLR *scanline, int len, FILE *fp, |
| 406 |
|
|
int nc, const float wlpt[4]); |
| 407 |
|
|
extern int fread2scan(COLOR *scanline, int len, FILE *fp, |
| 408 |
|
|
int nc, const float wlpt[4]); |
| 409 |
greg |
2.38 |
/* spectrum conversion, zero-fill past ends */ |
| 410 |
|
|
extern void convertscolor(SCOLOR dst, int dnc, double dwl0, double dwl1, |
| 411 |
|
|
const COLORV src[], int snc, double swl0, double swl1); |
| 412 |
|
|
/* the following use avg spectral ranges */ |
| 413 |
|
|
/* compare scolor_rgb() and scolor_cie() */ |
| 414 |
|
|
/* also, pcolor_color() and pcolor_colr() */ |
| 415 |
|
|
extern void setscolor(SCOLOR scol, double r, double g, double b); |
| 416 |
greg |
2.48 |
extern void scolor2color(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]); |
| 417 |
|
|
extern void scolor2colr(COLR clr, const SCOLOR scol, int ncs, const float wlpt[4]); |
| 418 |
greg |
2.50 |
extern void scolr2colr(COLR clr, const SCOLR sclr, int ncs, const float wlpt[4]); |
| 419 |
greg |
2.48 |
extern void scolor2scolr(SCOLR sclr, const SCOLOR scol, int ncs); |
| 420 |
|
|
extern void scolr2scolor(SCOLOR scol, const SCOLR sclr, int ncs); |
| 421 |
|
|
extern void scolr2color(COLOR col, const SCOLR sclr, int ncs, const float wlpt[4]); |
| 422 |
greg |
2.18 |
extern void setcolr(COLR clr, double r, double g, double b); |
| 423 |
greg |
2.38 |
extern void setscolr(SCOLR sclr, double r, double g, double b); |
| 424 |
greg |
2.48 |
extern double scolor_mean(const SCOLOR scol); |
| 425 |
|
|
extern double sintens(const SCOLOR scol); |
| 426 |
|
|
extern int bigdiff(const COLOR c1, const COLOR c2, double md); |
| 427 |
|
|
extern int sbigsdiff(const SCOLOR sc1, const SCOLOR sc2, double md); |
| 428 |
greg |
2.18 |
/* defined in spec_rgb.c */ |
| 429 |
greg |
2.48 |
extern void scolor_out(COLORV *cout, RGBPRIMS pr, const SCOLOR cres); |
| 430 |
greg |
2.38 |
extern void spec_cie(COLOR col, int s, int e); |
| 431 |
greg |
2.18 |
extern void spec_rgb(COLOR col, int s, int e); |
| 432 |
greg |
2.48 |
extern void cie_rgb(COLOR rgb, const COLOR xyz); |
| 433 |
greg |
2.18 |
extern int clipgamut(COLOR col, double brt, int gamut, |
| 434 |
greg |
2.48 |
const COLOR lower, const COLOR upper); |
| 435 |
|
|
extern void colortrans(COLOR c2, const COLORMAT mat, const COLOR c1); |
| 436 |
|
|
extern void multcolormat(COLORMAT m3, const COLORMAT m2, |
| 437 |
|
|
const COLORMAT m1); |
| 438 |
greg |
2.29 |
extern int colorprimsOK(RGBPRIMS pr); |
| 439 |
|
|
extern int compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr); |
| 440 |
|
|
extern int comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr); |
| 441 |
|
|
extern int comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 442 |
greg |
2.48 |
extern int compxyzWBmat(COLORMAT mat, const float wht1[2], const float wht2[2]); |
| 443 |
greg |
2.29 |
extern int compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr); |
| 444 |
|
|
extern int comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr); |
| 445 |
|
|
extern int comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 446 |
greg |
2.45 |
/* any uniform spectrum to working */ |
| 447 |
|
|
extern void convertscolorcol(SCOLOR rcol, const COLORV src[], int snc, |
| 448 |
|
|
double swl0, double swl1); |
| 449 |
greg |
2.38 |
/* most accurate spectral->tristim */ |
| 450 |
greg |
2.48 |
extern void scolor2cie(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]); |
| 451 |
|
|
extern void scolor2rgb(COLOR col, const SCOLOR scol, int ncs, const float wlpt[4]); |
| 452 |
|
|
extern double scolor2photopic(const SCOLOR scol, int ncs, const float wlpt[4]); |
| 453 |
|
|
extern double scolor2scotopic(const SCOLOR scol, int ncs, const float wlpt[4]); |
| 454 |
|
|
extern double scolor2melanopic(const SCOLOR scol, int ncs, const float wlpt[4]); |
| 455 |
|
|
extern double scolor_photopic(const SCOLOR scol); |
| 456 |
|
|
extern double scolor_scotopic(const SCOLOR scol); |
| 457 |
|
|
extern double scolor_melanopic(const SCOLOR scol); |
| 458 |
greg |
2.18 |
/* defined in colrops.c */ |
| 459 |
schorsch |
2.26 |
extern int setcolrcor(double (*f)(double, double), double a2); |
| 460 |
|
|
extern int setcolrinv(double (*f)(double, double), double a2); |
| 461 |
greg |
2.18 |
extern int setcolrgam(double g); |
| 462 |
|
|
extern int colrs_gambs(COLR *scan, int len); |
| 463 |
|
|
extern int gambs_colrs(COLR *scan, int len); |
| 464 |
|
|
extern void shiftcolrs(COLR *scan, int len, int adjust); |
| 465 |
|
|
extern void normcolrs(COLR *scan, int len, int adjust); |
| 466 |
|
|
|
| 467 |
|
|
#ifdef __cplusplus |
| 468 |
|
|
} |
| 469 |
greg |
2.6 |
#endif |
| 470 |
schorsch |
2.21 |
#endif /* _RAD_COLOR_H_ */ |
| 471 |
|
|
|
