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/* Copyright (c) 1990 Regents of the University of California */ |
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/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#include "color.h" |
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RGBPRIMS stdprims = STDPRIMS; /* standard primary chromaticities */ |
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/* |
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* The following table contains the CIE tristimulus integrals |
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* for X, Y, and Z. The table is cumulative, so that |
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} |
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}; |
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static float xyz2rgbmat[3][3] = { /* XYZ to RGB */ |
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COLORMAT xyz2rgbmat = { /* XYZ to RGB */ |
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{(CIE_y_g - CIE_y_b - CIE_x_b*CIE_y_g + CIE_y_b*CIE_x_g)/CIE_C_rD, |
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(CIE_x_b - CIE_x_g - CIE_x_b*CIE_y_g + CIE_x_g*CIE_y_b)/CIE_C_rD, |
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(CIE_x_g*CIE_y_b - CIE_x_b*CIE_y_g)/CIE_C_rD}, |
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(CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r)/CIE_C_bD} |
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}; |
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static float rgb2xyzmat[3][3] = { /* RGB to XYZ */ |
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COLORMAT rgb2xyzmat = { /* RGB to XYZ */ |
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{CIE_x_r*CIE_C_rD/CIE_D,CIE_x_g*CIE_C_gD/CIE_D,CIE_x_b*CIE_C_bD/CIE_D}, |
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{CIE_y_r*CIE_C_rD/CIE_D,CIE_y_g*CIE_C_gD/CIE_D,CIE_y_b*CIE_C_bD/CIE_D}, |
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{(1.-CIE_x_r-CIE_y_r)*CIE_C_rD/CIE_D, |
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e -= STARTWL; |
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if (e <= s) { |
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col[RED] = col[GRN] = col[BLU] = 0.0; |
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col[CIEX] = col[CIEY] = col[CIEZ] = 0.0; |
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return; |
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} |
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if (e >= INCWL*(NINC - 1)) |
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for (i = 0; i < 3; i++) |
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col[i] -= chroma[i][d]*(INCWL - r) - chroma[i][d + 1]*r; |
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col[RED] = (col[RED] + 0.5) / (256*INCWL); |
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col[GRN] = (col[GRN] + 0.5) / (256*INCWL); |
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col[BLU] = (col[BLU] + 0.5) / (256*INCWL); |
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col[CIEX] = (col[CIEX] + 0.5) * (1./(256*INCWL)); |
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col[CIEY] = (col[CIEY] + 0.5) * (1./(256*INCWL)); |
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col[CIEZ] = (col[CIEZ] + 0.5) * (1./(256*INCWL)); |
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} |
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cie_rgb(rgbcolor, ciecolor) /* convert CIE to RGB */ |
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register COLOR rgbcolor, ciecolor; |
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colortrans(c2, mat, c1, noneg) /* convert c1 by mat and put into c2 */ |
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register COLORMAT mat; |
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register COLOR c1, c2; |
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int noneg; |
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{ |
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register int i; |
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static float cout[3]; |
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for (i = 0; i < 3; i++) { |
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rgbcolor[i] = xyz2rgbmat[i][0]*ciecolor[0] + |
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xyz2rgbmat[i][1]*ciecolor[1] + |
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xyz2rgbmat[i][2]*ciecolor[2] ; |
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if (rgbcolor[i] < 0.0) |
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rgbcolor[i] = 0.0; |
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} |
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cout[0] = mat[0][0]*c1[0] + mat[0][1]*c1[1] + mat[0][2]*c1[2]; |
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cout[1] = mat[1][0]*c1[0] + mat[1][1]*c1[1] + mat[1][2]*c1[2]; |
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cout[2] = mat[2][0]*c1[0] + mat[2][1]*c1[1] + mat[2][2]*c1[2]; |
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if (!noneg) |
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return; |
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if ((c2[0] = cout[0]) < 0.) c2[0] = 0.; |
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if ((c2[1] = cout[1]) < 0.) c2[1] = 0.; |
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if ((c2[2] = cout[2]) < 0.) c2[2] = 0.; |
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} |
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rgb_cie(ciecolor, rgbcolor) /* convert RGB to CIE */ |
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register COLOR ciecolor, rgbcolor; |
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multcolormat(m3, m2, m1) /* multiply m1 by m2 and put into m3 */ |
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COLORMAT m1, m2, m3; /* m3 can be either m1 or m2 w/o harm */ |
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{ |
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register int i; |
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COLORMAT mt; |
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register int i, j; |
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for (i = 0; i < 3; i++) |
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ciecolor[i] = rgb2xyzmat[i][0]*rgbcolor[0] + |
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rgb2xyzmat[i][1]*rgbcolor[1] + |
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rgb2xyzmat[i][2]*rgbcolor[2] ; |
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for (j = 0; j < 3; j++) |
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mt[i][j] = m1[i][0]*m2[0][j] + |
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m1[i][1]*m2[1][j] + |
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m1[i][2]*m2[2][j] ; |
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cpcolormat(m3, mt); |
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} |
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compxyz2rgbmat(mat, pr) /* compute conversion from CIE to RGB space */ |
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COLORMAT mat; |
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register RGBPRIMS pr; |
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{ |
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double C_rD, C_gD, C_bD; |
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if (pr == stdprims) { /* can use xyz2rgbmat */ |
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cpcolormat(mat, xyz2rgbmat); |
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return; |
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} |
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C_rD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) - |
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pr[WHT][CIEY]*(pr[GRN][CIEX] - pr[BLU][CIEX]) + |
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pr[GRN][CIEX]*pr[BLU][CIEY] - pr[BLU][CIEX]*pr[GRN][CIEY] ) ; |
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C_gD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[BLU][CIEY] - pr[RED][CIEY]) - |
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pr[WHT][CIEY]*(pr[BLU][CIEX] - pr[RED][CIEX]) - |
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pr[RED][CIEX]*pr[BLU][CIEY] + pr[BLU][CIEX]*pr[RED][CIEY] ) ; |
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C_bD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[RED][CIEY] - pr[GRN][CIEY]) - |
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pr[WHT][CIEY]*(pr[RED][CIEX] - pr[GRN][CIEX]) + |
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pr[RED][CIEX]*pr[GRN][CIEY] - pr[GRN][CIEX]*pr[RED][CIEY] ) ; |
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mat[0][0] = (pr[GRN][CIEY] - pr[BLU][CIEY] - |
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pr[BLU][CIEX]*pr[GRN][CIEY] + |
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pr[BLU][CIEY]*pr[GRN][CIEX])/C_rD ; |
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mat[0][1] = (pr[BLU][CIEX] - pr[GRN][CIEX] - |
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pr[BLU][CIEX]*pr[GRN][CIEY] + |
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pr[GRN][CIEX]*pr[BLU][CIEY])/C_rD ; |
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mat[0][2] = (pr[GRN][CIEX]*pr[BLU][CIEY] - |
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pr[BLU][CIEX]*pr[GRN][CIEY])/C_rD ; |
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mat[1][0] = (pr[BLU][CIEY] - pr[RED][CIEY] - |
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pr[BLU][CIEY]*pr[RED][CIEX] + |
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pr[RED][CIEY]*pr[BLU][CIEX])/C_gD ; |
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mat[1][1] = (pr[RED][CIEX] - pr[BLU][CIEX] - |
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pr[RED][CIEX]*pr[BLU][CIEY] + |
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pr[BLU][CIEX]*pr[RED][CIEY])/C_gD ; |
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mat[1][2] = (pr[BLU][CIEX]*pr[RED][CIEY] - |
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pr[RED][CIEX]*pr[BLU][CIEY])/C_gD ; |
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mat[2][0] = (pr[RED][CIEY] - pr[GRN][CIEY] - |
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pr[RED][CIEY]*pr[GRN][CIEX] + |
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pr[GRN][CIEY]*pr[RED][CIEX])/C_bD ; |
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mat[2][1] = (pr[GRN][CIEX] - pr[RED][CIEX] - |
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pr[GRN][CIEX]*pr[RED][CIEY] + |
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pr[RED][CIEX]*pr[GRN][CIEY])/C_bD ; |
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mat[2][2] = (pr[RED][CIEX]*pr[GRN][CIEY] - |
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pr[GRN][CIEX]*pr[RED][CIEY])/C_bD ; |
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} |
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comprgb2xyzmat(mat, pr) /* compute conversion from RGB to CIE space */ |
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COLORMAT mat; |
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register RGBPRIMS pr; |
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{ |
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double C_rD, C_gD, C_bD, D; |
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if (pr == stdprims) { /* can use rgb2xyzmat */ |
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cpcolormat(mat, rgb2xyzmat); |
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return; |
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} |
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C_rD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) - |
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pr[WHT][CIEY]*(pr[GRN][CIEX] - pr[BLU][CIEX]) + |
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pr[GRN][CIEX]*pr[BLU][CIEY] - pr[BLU][CIEX]*pr[GRN][CIEY] ) ; |
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C_gD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[BLU][CIEY] - pr[RED][CIEY]) - |
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pr[WHT][CIEY]*(pr[BLU][CIEX] - pr[RED][CIEX]) - |
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pr[RED][CIEX]*pr[BLU][CIEY] + pr[BLU][CIEX]*pr[RED][CIEY] ) ; |
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C_bD = (1./pr[WHT][CIEY]) * |
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( pr[WHT][CIEX]*(pr[RED][CIEY] - pr[GRN][CIEY]) - |
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pr[WHT][CIEY]*(pr[RED][CIEX] - pr[GRN][CIEX]) + |
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pr[RED][CIEX]*pr[GRN][CIEY] - pr[GRN][CIEX]*pr[RED][CIEY] ) ; |
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D = pr[RED][CIEX]*(pr[GRN][CIEY] - pr[BLU][CIEY]) + |
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pr[GRN][CIEX]*(pr[BLU][CIEY] - pr[RED][CIEY]) + |
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pr[BLU][CIEX]*(pr[RED][CIEY] - pr[GRN][CIEY]) ; |
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mat[0][0] = pr[RED][CIEX]*C_rD/D; |
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mat[0][1] = pr[GRN][CIEX]*C_gD/D; |
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mat[0][2] = pr[BLU][CIEX]*C_bD/D; |
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mat[1][0] = pr[RED][CIEY]*C_rD/D; |
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mat[1][1] = pr[GRN][CIEY]*C_gD/D; |
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mat[1][2] = pr[BLU][CIEY]*C_bD/D; |
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mat[2][0] = (1.-pr[RED][CIEX]-pr[RED][CIEY])*C_rD/D; |
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mat[2][1] = (1.-pr[GRN][CIEX]-pr[GRN][CIEY])*C_gD/D; |
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mat[2][2] = (1.-pr[BLU][CIEX]-pr[BLU][CIEY])*C_bD/D; |
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} |
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comprgb2rgbmat(mat, pr1, pr2) /* compute conversion from RGB1 to RGB2 */ |
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COLORMAT mat; |
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RGBPRIMS pr1, pr2; |
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{ |
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COLORMAT pr1toxyz, xyztopr2; |
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if (pr1 == pr2) { |
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mat[0][0] = mat[1][1] = mat[2][2] = 1.0; |
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mat[0][1] = mat[0][2] = mat[1][0] = |
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mat[1][2] = mat[2][0] = mat[2][1] = 0.0; |
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return; |
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} |
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comprgb2xyzmat(pr1toxyz, pr1); |
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compxyz2rgbmat(xyztopr2, pr2); |
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/* combine transforms */ |
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multcolormat(mat, pr1toxyz, xyztopr2); |
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} |
