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add documentation explaining why even a 64K table for srgb_to_uint8 would be inaccurate

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Sean Barrett 2014-09-13 08:21:14 -07:00
parent 9a6af9a8d3
commit 8849501a3f
1 changed files with 4 additions and 0 deletions
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stb_image_resize.h
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@ -565,6 +565,10 @@ static float stbir__srgb_uchar_to_linear_float[256] = {
}; };
// sRGB transition values, scaled by 1<<28 // sRGB transition values, scaled by 1<<28
// note that if you only scaled by 1<<16, all the values would be 4K smaller,
// so [1] would be ~10, and so that would have around 5% error (10 +- 0.5)
// at the boundary between uint8 0 and 1. This also means that a 64K-entry table
// would have the same 5% error there.
static int stbir__srgb_offset_to_linear_scaled[256] = static int stbir__srgb_offset_to_linear_scaled[256] =
{ {
0, 40738, 122216, 203693, 285170, 366648, 448125, 529603, 0, 40738, 122216, 203693, 285170, 366648, 448125, 529603,