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Remove libpng's png_set_gamma

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Stragus suggested:

It will degrade quality by converting from true sRGB to ^2.2 and
then rounding the values back on 8 bits
This commit is contained in:
Benau 2017-03-17 13:17:38 +08:00
parent 41844de6a5
commit 09e2f96ba8
1 changed files with 0 additions and 14 deletions
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14
lib/irrlicht/source/Irrlicht/CImageLoaderPNG.cpp
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@ -174,20 +174,6 @@ IImage* CImageLoaderPng::loadImage(io::IReadFile* file, bool skip_checking) cons
if (ColorType==PNG_COLOR_TYPE_GRAY || ColorType==PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
int intent;
const double screen_gamma = 2.2;
if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_gamma(png_ptr, screen_gamma, 0.45455);
else
{
double image_gamma;
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
png_set_gamma(png_ptr, screen_gamma, image_gamma);
else
png_set_gamma(png_ptr, screen_gamma, 0.45455);
}
// Update the changes in between, as we need to get the new color type
// for proper processing of the RGBA type
png_read_update_info(png_ptr, info_ptr);