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D3DX10SaveTextureToFile and 8bit Textures

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I'm creating batches of 8bit textures that I wish to save to file and currently attempting to use D3DX10SaveTextureToFile with files of format DXGI_FORMAT_R8_UNORM (although I have tried the other 8bit variants) and an output image file format of D3DX10_IFF_BMP, and giving me the error "Can't find matching WIC format." This process works flawlessly using a texture format such as DXGI_FORMAT_R8G8B8A8_UNORM. I could output the file manually, but I suppose I would rather use the API if it provides the mechanism for me. 8-bit is a valid bit depth for a bitmap, so I'm surprised it doesn't work - or more likely, missing something obvious. Also, could anybody tell me what WIC refers to? Cheers.

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It's entirely possible that the WIC BMP encoder doesn't support 8-bit bitmaps. I'm trying to look through the documentation to see what sort of pixel formats it supports, but haven't found anything useful yet. I'll certainly post it her if I find anything.

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