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tif: rescale palette color map to [0, 255]

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This commit is contained in:
ppatience0 2013-07-03 20:49:33 -04:00
parent 883deac573
commit e6b647e8ec
1 changed files with 7 additions and 1 deletions
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8
sys/src/cmd/jpg/readtif.c
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@ -1286,10 +1286,16 @@ static int
paldecode(Tif *t, Rawimage *im, uchar *data)
{
int pix, pmask, xmask;
ulong i, n, x, y, *r, *g, *b;
ulong i, n, x, y, *r, *g, *b, max;
pmask = (1 << t->depth) - 1;
xmask = 7 >> log2[t->depth];
for(i = max = 0; i < t->ncolor; i++) {
if(t->color[i] > max)
max = t->color[i];
}
for(i = 0; i < t->ncolor; i++)
t->color[i] = (t->color[i] * 0xff) / max;
r = t->color;
g = r + pmask + 1;
b = g + pmask + 1;