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#include <stdio.h> |
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+ |
#include <math.h> |
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+ |
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#include "rasterfile.h" |
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#include "color.h" |
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extern long ftell(); |
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44 |
< |
extern double pow(); |
44 |
> |
double gamcor = 2.2; /* gamma correction */ |
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44 |
– |
double gamma = 2.2; /* gamma correction */ |
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– |
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int bradj = 0; /* brightness adjustment */ |
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pic *inpic, *outpic; |
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dither = !dither; |
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break; |
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case 'g': |
80 |
< |
gamma = atof(argv[++i]); |
80 |
> |
gamcor = atof(argv[++i]); |
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break; |
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case 'b': |
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greyscale = !greyscale; |
258 |
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/* convert table */ |
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for (i = 0; i < h->ras_maplength/3; i++) |
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setcolr(ctab[i], |
261 |
< |
pow((cmap[0][i]+.5)/256.,gamma), |
262 |
< |
pow((cmap[1][i]+.5)/256.,gamma), |
263 |
< |
pow((cmap[2][i]+.5)/256.,gamma)); |
261 |
> |
pow((cmap[0][i]+.5)/256.,gamcor), |
262 |
> |
pow((cmap[1][i]+.5)/256.,gamcor), |
263 |
> |
pow((cmap[2][i]+.5)/256.,gamcor)); |
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if (bradj) |
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shiftcolrs(ctab, 256, bradj); |
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/* convert file */ |
361 |
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register int i, val; |
362 |
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for (i = 0; i < 256; i++) { |
364 |
< |
val = pow((i+0.5)/256.0, 1.0/gamma) * 256.0; |
364 |
> |
val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0; |
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map[0][i] = map[1][i] = map[2][i] = val; |
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} |
367 |
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} |