39 lines
978 B
C
39 lines
978 B
C
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/*
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* Colors in the strange XYZ space. new 9 avr 2007, ave St Exupery
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*/
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#include <stdio.h>
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#include <math.h>
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#include "tthimage.h"
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/*::------------------------------------------------------------------::*/
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int
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Image_pix_rgb2xyz_d(int r, int g, int b, double *px, double *py, double *pz)
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{
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double dr, dg, db, dx, dy, dz;
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#if TRACE
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fprintf(stderr, "%s (%3d %3d %3d) -> ", __func__, r, g, b);
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#endif
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dr = (double)r / 256.0;
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dg = (double)g / 256.0;
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db = (double)b / 256.0;
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dx = 2.7688 * dr + 1.7517 * dg + 1.1301 * db;
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dy = 1.0000 * dr + 4.5907 * dg + 0.0601 * db;
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dz = 0.0001 * dr + 0.0565 * dg + 5.5942 * db;
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#if TRACE
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fprintf(stderr, "(%f, %f, %f)\n", dx, dy, dz);
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#endif
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*px = dx, *py = dy, *pz = dz;
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return FULL_NUCKED;
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}
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/*::------------------------------------------------------------------::*/
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/*::------------------------------------------------------------------::*/
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/*::------------------------------------------------------------------::*/
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