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/* RCSid $Id: color.h,v 2.44 2023/12/16 01:00:02 greg Exp $ */ |
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/* |
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* color.h - header for routines using pixel color and spectral values |
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* |
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* Two color representations are used, one for calculation and |
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* another for storage. Calculation is done with three floats |
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* for speed. Stored color values use 4 bytes which contain |
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* three single byte mantissas and a common exponent. |
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* |
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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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* A new Radiance format is provided for spectral pictures, |
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* and spectral colors must be converted by caller if the |
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* sampling doesn't match. |
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*/ |
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#ifndef _RAD_COLOR_H_ |
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#define _RAD_COLOR_H_ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#ifndef MAXCSAMP |
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#define MAXCSAMP 24 /* maximum # spectral samples */ |
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#endif |
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|
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#define RED 0 |
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#define GRN 1 |
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#define BLU 2 |
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#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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#define COLXS 128 /* excess used for exponent */ |
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#define WHT 3 /* used for RGBPRIMS type */ |
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|
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#undef uby8 |
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#define uby8 unsigned char /* 8-bit unsigned integer */ |
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|
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typedef uby8 COLR[4]; /* red, green, blue (or X,Y,Z), exponent */ |
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typedef uby8 SCOLR[MAXCSAMP+1]; /* spectral color, common exponent */ |
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|
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typedef float COLORV; |
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typedef COLORV COLOR[3]; /* red, green, blue (or X,Y,Z) */ |
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typedef COLORV SCOLOR[MAXCSAMP]; /* spectral color */ |
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|
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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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|
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typedef float COLORMAT[3][3]; /* color coordinate conversion matrix */ |
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|
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#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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|
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#define colval(col,pri) (col)[pri] |
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|
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#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b)) |
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|
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#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf)) |
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|
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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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|
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#define copycolor(c1,c2) opcolor(c1,=,c2) |
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|
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#define addcolor(c1,c2) opcolor(c1,+=,c2) |
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|
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#define multcolor(c1,c2) opcolor(c1,*=,c2) |
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|
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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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|
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#define copyscolr(sc1,sc2) memcpy(sc1,sc2,LSCOLR) |
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|
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#define scolval(sc,pri) (sc)[CNDX[pri]] |
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|
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#define copyscolor(sc1,sc2) memcpy(sc1,sc2,sizeof(COLORV)*NCSAMP) |
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|
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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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|
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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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|
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#define sopscolor(sc1,op,sc2) {int _i=NCSAMP; while (_i--) (sc1)[_i] op (sc2)[_i];} |
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|
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#define saddscolor(sc1,sc2) sopscolor(sc1,+=,sc2) |
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|
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#define smultscolor(sc1,sc2) sopscolor(sc1,*=,sc2) |
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|
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#define scolrblack(c) memset(c,0,LSCOLR) |
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|
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#define scolorblack(c) memset(c,0,sizeof(COLORV)*NCSAMP) |
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|
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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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|
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#define sopcolor(sc1,op,c2) {SCOLOR _sct;\ |
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setscolor(_sct,(c2)[RED],(c2)[GRN],(c2)[BLU]);\ |
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sopscolor(sc1,op,_sct);} |
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|
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#define saddcolor(sc1,c2) sopcolor(sc1,+=,c2) |
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|
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#define smultcolor(sc1,c2) sopcolor(sc1,*=,c2) |
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|
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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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|
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#define addscolor(c1,sc2) opscolor(c1,+=,sc2) |
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|
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#define multscolor(c1,sc2) opscolor(c1,*=,sc2) |
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|
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#if defined(NTSC_RGB) |
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#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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#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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#define CIE_y_w (1./3.) |
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#else |
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#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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#define CIE_x_w (1./3.) /* use EE white */ |
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#define CIE_y_w (1./3.) |
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#endif |
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|
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#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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|
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#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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|
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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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|
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/* Default CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */ |
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|
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/***** The following definitions are not for XYZ colors *****/ |
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|
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#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU]) |
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#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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#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 ) |
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#define normpbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[CNDX[RED]] + \ |
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(long)(CIE_gf*256.+.5)*(c)[CNDX[GRN]] + \ |
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(long)(CIE_bf*256.+.5)*(c)[CNDX[BLU]] ) >> 8 ) |
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|
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/* luminous efficacies over visible spectrum */ |
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#define MAXEFFICACY 683. /* defined maximum at 550 nm */ |
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#define WHTEFFICACY 179. /* equal energy white 380-780nm */ |
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#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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#define SKYEFFICACY D65EFFICACY /* skylight (should be 110) */ |
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#define DAYEFFICACY D65EFFICACY /* combined sky and solar */ |
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#define WHTSCOTOPIC 412. /* scotopic EE white 380-780nm */ |
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#define WHTMELANOPIC 179. /* melanopic EE white 380-780nm */ |
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|
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#define luminance(col) (WHTEFFICACY * bright(col)) |
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#define pluminance(scol) (WHTEFFICACY * pbright(scol)) |
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|
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#define scolor_rgb(col,scol) scolor2rgb(col,scol,NCSAMP,WLPART) |
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|
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/***** ...end of stuff specific to RGB colors *****/ |
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|
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#define scolor_cie(col,scol) scolor2cie(col,scol,NCSAMP,WLPART) |
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|
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#define sluminance(scol) (WHTEFFICACY * scolor_photopic(scol)) |
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|
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#define intens(col) ( (col)[0] > (col)[1] \ |
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? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \ |
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: (col)[1] > (col)[2] ? (col)[1] : (col)[2] ) |
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|
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#define colrval(c,p) ( (c)[EXP] ? \ |
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ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \ |
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0. ) |
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|
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#define scolrval(c,p) ( (c)[CNDX[EXP]] ? \ |
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ldexp((c)[CNDX[p]]+.5,(int)(c)[CNDX[EXP]]-(COLXS+8)) : \ |
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0. ) |
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|
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#define WHTCOLOR {1.0,1.0,1.0} |
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#define BLKCOLOR {0.0,0.0,0.0} |
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#define WHTCOLR {128,128,128,COLXS+1} |
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#define BLKCOLR {0,0,0,0} |
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|
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/* picture format identifier */ |
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#define COLRFMT "32-bit_rle_rgbe" |
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#define CIEFMT "32-bit_rle_xyze" |
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#define PICFMT "32-bit_rle_???e" /* matches either */ |
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#define SPECFMT "Radiance_spectra" /* spectral data w/ exponent */ |
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|
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/* Number of spectral components */ |
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#define NCOMPSTR "NCOMP=" |
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#define LNCOMPSTR 6 |
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#define isncomp(hl) !strncmp(hl,NCOMPSTR,LNCOMPSTR) |
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#define ncompval(hl) atoi((hl)+LNCOMPSTR) |
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#define fputncomp(nc,fp) fprintf(fp,"%s%d\n",NCOMPSTR,nc) |
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|
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/* 4 wavelength partitions for (IR+)R,G,B(+UV) */ |
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#define WLSPLTSTR "WAVELENGTH_SPLITS=" |
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#define LWLSPLTSTR 18 |
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#define iswlsplit(hl) !strncmp(hl,WLSPLTSTR,LWLSPLTSTR) |
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#define wlsplitval(w,hl) (sscanf((hl)+LWLSPLTSTR,"%f %f %f %f",\ |
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&(w)[0],&(w)[1],&(w)[2],&(w)[3]) == 4) |
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#define fputwlsplit(w,fp) fprintf(fp,"%s %g %g %g %g\n",WLSPLTSTR,\ |
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(w)[0],(w)[1],(w)[2],(w)[3]) |
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|
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/* macros for exposures */ |
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#define EXPOSSTR "EXPOSURE=" |
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#define LEXPOSSTR 9 |
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#define isexpos(hl) !strncmp(hl,EXPOSSTR,LEXPOSSTR) |
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#define exposval(hl) atof((hl)+LEXPOSSTR) |
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#define fputexpos(ex,fp) fprintf(fp,"%s%.4e\n",EXPOSSTR,ex) |
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|
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/* macros for pixel aspect ratios */ |
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#define ASPECTSTR "PIXASPECT=" |
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#define LASPECTSTR 10 |
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#define isaspect(hl) !strncmp(hl,ASPECTSTR,LASPECTSTR) |
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#define aspectval(hl) atof((hl)+LASPECTSTR) |
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#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa) |
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|
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/* macros for primary specifications */ |
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#define PRIMARYSTR "PRIMARIES=" |
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#define LPRIMARYSTR 10 |
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#define isprims(hl) !strncmp(hl,PRIMARYSTR,LPRIMARYSTR) |
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#define primsval(p,hl) (sscanf((hl)+LPRIMARYSTR, \ |
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"%f %f %f %f %f %f %f %f", \ |
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&(p)[RED][CIEX],&(p)[RED][CIEY], \ |
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&(p)[GRN][CIEX],&(p)[GRN][CIEY], \ |
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&(p)[BLU][CIEX],&(p)[BLU][CIEY], \ |
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&(p)[WHT][CIEX],&(p)[WHT][CIEY]) == 8) |
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#define fputprims(p,fp) fprintf(fp, \ |
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"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\ |
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PRIMARYSTR, \ |
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(p)[RED][CIEX],(p)[RED][CIEY], \ |
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(p)[GRN][CIEX],(p)[GRN][CIEY], \ |
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(p)[BLU][CIEX],(p)[BLU][CIEY], \ |
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(p)[WHT][CIEX],(p)[WHT][CIEY]) |
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|
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/* macros for color correction */ |
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#define COLCORSTR "COLORCORR=" |
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#define LCOLCORSTR 10 |
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#define iscolcor(hl) !strncmp(hl,COLCORSTR,LCOLCORSTR) |
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#define colcorval(cc,hl) sscanf((hl)+LCOLCORSTR,"%f %f %f", \ |
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&(cc)[RED],&(cc)[GRN],&(cc)[BLU]) |
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#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \ |
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(cc)[RED],(cc)[GRN],(cc)[BLU]) |
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|
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/* |
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* Conversions to and from XYZ space generally don't apply WHTEFFICACY. |
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* If you need Y to be luminance (cd/m^2), this must be applied when |
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* converting from radiance (watts/sr/m^2). |
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*/ |
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|
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extern int CNDX[4]; /* RGBE indices for SCOLOR, SCOLR */ |
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extern float WLPART[4]; /* RGB wavelength limits+partitions (nm) */ |
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extern RGBPRIMS stdprims; /* standard primary chromaticities */ |
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extern RGBPRIMS xyzprims; /* to indicate XYZ input or output */ |
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extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */ |
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extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */ |
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extern COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */ |
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|
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#define CGAMUT_LOWER 01 |
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#define CGAMUT_UPPER 02 |
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#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER) |
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|
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#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb) |
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|
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#define cpcolormat(md,ms) memcpy((void *)md,(void *)ms,sizeof(COLORMAT)) |
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|
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/* defined in color.c */ |
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extern void *tempbuffer(size_t len); |
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/* in cn[3]=nsamps, wlpt[0],wlpt[3]=extrema */ |
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extern int setspectrsamp(int cn[4], float wlpt[4]); |
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extern int fwritecolrs(COLR *scanline, int len, FILE *fp); |
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extern int fwritescan(COLOR *scanline, int len, FILE *fp); |
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extern int fwritescolrs(uby8 *sscanline, int nc, int len, FILE *fp); |
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extern int fwritesscan(COLORV *sscanline, int nc, int len, FILE *fp); |
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extern int freadcolrs(COLR *scanline, int len, FILE *fp); |
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extern int freadscan(COLOR *scanline, int len, FILE *fp); |
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extern int freadscolrs(uby8 *scanline, int nc, int len, FILE *fp); |
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extern int freadsscan(COLORV *sscanline, int nc, int len, FILE *fp); |
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/* spectrum conversion, zero-fill past ends */ |
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extern void convertscolor(SCOLOR dst, int dnc, double dwl0, double dwl1, |
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const COLORV src[], int snc, double swl0, double swl1); |
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/* the following use avg spectral ranges */ |
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/* compare scolor_rgb() and scolor_cie() */ |
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/* also, pcolor_color() and pcolor_colr() */ |
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extern void setscolor(SCOLOR scol, double r, double g, double b); |
| 342 |
extern void scolor2color(COLOR col, SCOLOR scol, int ncs, const float wlpt[4]); |
| 343 |
extern void scolor2colr(COLR clr, SCOLOR scol, int ncs, const float wlpt[4]); |
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extern void scolor2scolr(SCOLR sclr, SCOLOR scol, int ncs); |
| 345 |
extern void colr_color(COLOR col, COLR clr); |
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extern void scolr2scolor(SCOLOR scol, SCOLR sclr, int ncs); |
| 347 |
extern void scolr2color(COLOR col, SCOLR sclr, int ncs, const float wlpt[4]); |
| 348 |
extern void colr_scolor(SCOLOR scol, COLR clr); |
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extern void setcolr(COLR clr, double r, double g, double b); |
| 350 |
extern void setscolr(SCOLR sclr, double r, double g, double b); |
| 351 |
extern double scolor_mean(SCOLOR scol); |
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extern double sintens(SCOLOR scol); |
| 353 |
extern int bigdiff(COLOR c1, COLOR c2, double md); |
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extern int sbigsdiff(SCOLOR sc1, SCOLOR sc2, double md); |
| 355 |
/* defined in spec_rgb.c */ |
| 356 |
extern void spec_cie(COLOR col, int s, int e); |
| 357 |
extern void spec_rgb(COLOR col, int s, int e); |
| 358 |
extern void cie_rgb(COLOR rgb, COLOR xyz); |
| 359 |
extern int clipgamut(COLOR col, double brt, int gamut, |
| 360 |
COLOR lower, COLOR upper); |
| 361 |
extern void colortrans(COLOR c2, COLORMAT mat, COLOR c1); |
| 362 |
extern void multcolormat(COLORMAT m3, COLORMAT m2, |
| 363 |
COLORMAT m1); |
| 364 |
extern int colorprimsOK(RGBPRIMS pr); |
| 365 |
extern int compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr); |
| 366 |
extern int comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr); |
| 367 |
extern int comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 368 |
extern int compxyzWBmat(COLORMAT mat, float wht1[2], |
| 369 |
float wht2[2]); |
| 370 |
extern int compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr); |
| 371 |
extern int comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr); |
| 372 |
extern int comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 373 |
/* any uniform spectrum to working */ |
| 374 |
extern void convertscolorcol(SCOLOR rcol, const COLORV src[], int snc, |
| 375 |
double swl0, double swl1); |
| 376 |
/* most accurate spectral->tristim */ |
| 377 |
extern void scolor2cie(COLOR col, SCOLOR scol, int ncs, const float wlpt[4]); |
| 378 |
extern void scolor2rgb(COLOR col, SCOLOR scol, int ncs, const float wlpt[4]); |
| 379 |
extern double scolor2photopic(SCOLOR scol, int ncs, const float wlpt[4]); |
| 380 |
extern double scolor2scotopic(SCOLOR scol, int ncs, const float wlpt[4]); |
| 381 |
extern double scolor2melanopic(SCOLOR scol, int ncs, const float wlpt[4]); |
| 382 |
extern double scolor_photopic(SCOLOR scol); |
| 383 |
extern double scolor_scotopic(SCOLOR scol); |
| 384 |
extern double scolor_melanopic(SCOLOR scol); |
| 385 |
/* defined in colrops.c */ |
| 386 |
extern int setcolrcor(double (*f)(double, double), double a2); |
| 387 |
extern int setcolrinv(double (*f)(double, double), double a2); |
| 388 |
extern int setcolrgam(double g); |
| 389 |
extern int colrs_gambs(COLR *scan, int len); |
| 390 |
extern int gambs_colrs(COLR *scan, int len); |
| 391 |
extern void shiftcolrs(COLR *scan, int len, int adjust); |
| 392 |
extern void normcolrs(COLR *scan, int len, int adjust); |
| 393 |
|
| 394 |
#ifdef __cplusplus |
| 395 |
} |
| 396 |
#endif |
| 397 |
#endif /* _RAD_COLOR_H_ */ |
| 398 |
|
