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POWhat are the exact color spaces of DXGI_FORMATs?
 

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  1. POWhat are the exact color spaces of DXGI_FORMATs?
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    <p>In the official documentation of DXGI_FORMAT, it tells us that only a format with _SRGB enumeration postfix is in sRGB color space. I thought other format without this postfix are all in the linear space. But I found a very strange behavior of format conversion function in DirectXTex library. ( You can download it from <a href="http://directxtex.codeplex.com/" rel="nofollow">http://directxtex.codeplex.com/</a> )</p> <p>At first, I exported a texture file as DXGI_FORMAT_R32G32B32A32_FLOAT by using NVIDIA Photoshop DDS Plugin. Then I load this file by LoadFromDDSFile() function, and convert its format to DXGI_FORMAT_R16G16B16A16_UNORM by Convert() function. (Both of these two functions are provided by DirectXTex library.)</p> <p>You guess what? After the image was converted to DXGI_FORMAT_R16G16B16A16_UNORM, the brightness of all pixels were also changed, the whole image becomes brighter than before.</p> <p>If I manually convert the pixel values from sRGB space to Linear space after the image was converted to DXGI_FORMAT_R16G16B16A16_UNORM format, the resultant pixel values are same as input. Therefore, I suppose that the DirectXTex library treats DXGI_FORMAT_R32G32B32A32_FLOAT as a format in linear color space, and treats DXGI_FORMAT_R16G16B16A16_UNORM as a format in sRGB color space, then it did the color space transforming from linear space to sRGB space. ( I tried to find out why the Convert() function also converts the color space, but it was implemented by WIC, and there is no source code for it. )</p> <p>So, is there any bug in DirectXTex library? Or is it the real standard for DXGI_FORMATs? If there were different color spaces for some special DXGI_FORMATs, please tell me that where can I find the specification for it.</p> <p>Any help will be grateful. Thanks!</p>
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