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#include <stdio.h> |
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#include <string.h> |
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#include <math.h> |
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#include "color.h" |
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#define CEPS 1e-4 /* color epsilon */ |
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COLOR ciecolor; |
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spec_cie(ciecolor, s, e); |
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< |
cie_rgb(col, ciecolor); |
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> |
colortrans(col, xyz2rgbmat, ciecolor); |
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} |
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static double |
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spec_dot( /* spectrum dot-product with cumulative observer */ |
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< |
SCOLOR scol, |
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const SCOLOR scol, |
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int ncs, |
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< |
float wlpt[4], |
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> |
const float wlpt[4], |
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const unsigned short cumul[], |
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int wlmin, |
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int wlmax |
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while (n < ncs) { |
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int wl0 = wl1; |
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< |
wl1 = (int)(ncs==3 ? wlpt[ncs-1-n] : wlpt[3] + (n+1)*wlstp); |
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wl1 = (int)(ncs==3 ? wlpt[2-n] : wlpt[3] + (n+1)*wlstp); |
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if (wl1 >= wlmax) { |
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sum += (65535 - cumul[wl0-wlmin]) * scol[n]; |
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sum += (65535 - cumul[wl0-wlmin]) * scol[ncs-1-n]; |
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break; |
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} |
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< |
sum += (cumul[wl1-wlmin] - cumul[wl0-wlmin]) * scol[n++]; |
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sum += (cumul[wl1-wlmin] - cumul[wl0-wlmin]) * scol[ncs-1-n++]; |
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} |
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return(sum * (1./65535.)); |
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} |
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void |
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scolor2cie( /* accurate conversion from spectrum to XYZ */ |
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COLOR col, |
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< |
SCOLOR scol, |
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> |
const SCOLOR scol, |
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int ncs, |
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< |
float wlpt[4] |
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const float wlpt[4] |
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) |
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{ |
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if (ncs == 3) { /* not a spectrum! */ |
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void |
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scolor2rgb( /* accurate conversion from spectrum to RGB */ |
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COLOR col, |
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< |
SCOLOR scol, |
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> |
const SCOLOR scol, |
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int ncs, |
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< |
float wlpt[4] |
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> |
const float wlpt[4] |
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) |
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{ |
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COLOR ciecolor; |
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} |
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void |
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scolor_out( /* prepare (spectral) color for output */ |
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COLORV *cout, |
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RGBPRIMS pr, |
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const SCOLOR cres |
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) |
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{ |
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static COLORMAT xyz2myp; |
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static RGBPRIMP lastp = NULL; |
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|
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if (!pr) { /* output is spectral */ |
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copyscolor(cout, cres); |
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} else if (pr == stdprims) { /* output is standard RGB */ |
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scolor_rgb(cout, cres); |
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} else if (pr == xyzprims) { /* output is XYZ */ |
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scolor_cie(cout, cres); |
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scalecolor(cout, WHTEFFICACY); |
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} else if (NCSAMP > 3) { /* spectral -> custom RGB */ |
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COLOR xyz; |
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if (lastp != pr) |
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compxyz2rgbWBmat(xyz2myp, lastp=pr); |
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scolor_cie(xyz, cres); |
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colortrans(cout, xyz2myp, xyz); |
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clipgamut(cout, xyz[CIEY], CGAMUT_LOWER, cblack, cwhite); |
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} else { /* else copy unknown RGB */ |
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copycolor(cout, cres); |
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} |
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} |
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|
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|
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double |
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scolor_photopic( /* compute scotopic integral for spectral color */ |
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< |
SCOLOR scol |
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scolor2photopic( /* compute scotopic integral for spectral color */ |
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const SCOLOR scol, |
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int ncs, |
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const float wlpt[4] |
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) |
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{ |
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if (NCSAMP == 3) |
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if (ncs == 3) |
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return bright(scol); |
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|
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< |
return(spec_dot(scol, NCSAMP, WLPART, cie_y_cumul, CIE_Y_WLMIN, CIE_Y_WLMAX)); |
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> |
return(spec_dot(scol, ncs, wlpt, cie_y_cumul, CIE_Y_WLMIN, CIE_Y_WLMAX)); |
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} |
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|
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double |
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scolor2scotopic( /* compute Y channel for spectral color */ |
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const SCOLOR scol, |
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int ncs, |
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const float wlpt[4] |
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) |
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{ |
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return(spec_dot(scol, ncs, wlpt, scotopic_cumul, SCOTOPIC_WLMIN, SCOTOPIC_WLMAX)); |
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} |
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|
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|
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double |
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scolor2melanopic( /* compute melanopic integral for spectral color */ |
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const SCOLOR scol, |
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int ncs, |
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const float wlpt[4] |
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) |
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{ |
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return(spec_dot(scol, ncs, wlpt, melanopic_cumul, MELANOPIC_WLMIN, MELANOPIC_WLMAX)); |
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} |
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|
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|
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double |
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scolor_photopic( /* compute scotopic integral for spectral color */ |
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const SCOLOR scol |
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) |
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{ |
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return(scolor2photopic(scol, NCSAMP, WLPART)); |
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} |
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|
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|
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double |
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scolor_scotopic( /* compute Y channel for spectral color */ |
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< |
SCOLOR scol |
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> |
const SCOLOR scol |
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) |
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{ |
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return(spec_dot(scol, NCSAMP, WLPART, scotopic_cumul, SCOTOPIC_WLMIN, SCOTOPIC_WLMAX)); |
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return(scolor2scotopic(scol, NCSAMP, WLPART)); |
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} |
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|
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|
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double |
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scolor_melanopic( /* compute melanopic integral for spectral color */ |
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< |
SCOLOR scol |
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> |
const SCOLOR scol |
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) |
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{ |
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return(spec_dot(scol, NCSAMP, WLPART, melanopic_cumul, MELANOPIC_WLMIN, MELANOPIC_WLMAX)); |
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> |
return(scolor2melanopic(scol, NCSAMP, WLPART)); |
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} |
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void |
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convertscolorcol( /* any uniform spectrum to working */ |
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SCOLOR rcol, |
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const COLORV src[], |
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int snc, |
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double swl0, |
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double swl1 |
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) |
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{ |
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if (NCSAMP > 3) { /* spectrum -> spectrum */ |
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convertscolor(rcol, NCSAMP, WLPART[0], WLPART[3], |
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src, snc, swl0, swl1); |
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} else if ((snc <= MAXCSAMP) & (swl0 > swl1)) { |
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float wlpt[4]; /* no intermediate conversion needed */ |
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wlpt[0] = swl0; wlpt[3] = swl1; |
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wlpt[1] = WLPART[1]; wlpt[2] = WLPART[2]; |
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scolor2rgb(rcol, (COLORV *)src, snc, wlpt); |
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} else { |
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SCOLOR dcol; /* else convert spectrum first */ |
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int dnc = snc*(WLPART[0] - WLPART[3])/fabs(swl0 - swl1) + .99; |
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if (dnc > MAXCSAMP) dnc = MAXCSAMP; |
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convertscolor(dcol, dnc, WLPART[0], WLPART[3], src, snc, swl0, swl1); |
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scolor2rgb(rcol, dcol, dnc, WLPART); |
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} |
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} |
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|
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|
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void |
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cie_rgb( /* convert CIE color to standard RGB */ |
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COLOR rgb, |
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< |
COLOR xyz |
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> |
const COLOR xyz |
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) |
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{ |
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colortrans(rgb, xyz2rgbmat, xyz); |
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COLOR col, |
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double brt, |
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int gamut, |
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< |
COLOR lower, |
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< |
COLOR upper |
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> |
const COLOR lower, |
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> |
const COLOR upper |
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) |
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{ |
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int rflags = 0; |
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void |
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colortrans( /* convert c1 by mat and put into c2 */ |
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COLOR c2, |
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< |
COLORMAT mat, |
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< |
COLOR c1 |
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> |
const COLORMAT mat, |
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> |
const COLOR c1 |
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) |
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{ |
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COLOR cout; |
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void |
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multcolormat( /* multiply m1 by m2 and put into m3 */ |
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COLORMAT m3, /* m3 can be either m1 or m2 w/o harm */ |
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< |
COLORMAT m2, |
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< |
COLORMAT m1 |
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> |
const COLORMAT m2, |
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> |
const COLORMAT m1 |
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) |
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{ |
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COLORMAT mt; |
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int |
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compxyzWBmat( /* CIE von Kries transform from wht1 to wht2 */ |
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COLORMAT mat, |
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< |
float wht1[2], |
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< |
float wht2[2] |
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> |
const float wht1[2], |
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> |
const float wht2[2] |
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) |
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{ |
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COLOR cw1, cw2; |