Hello! when im saving as NVIDIA Texture Tool DDS then importing it into OpenIV then the picture gets super light. is it some fix for this?
Hi svrresvoid00!
It sounds like OpenIV might be interpreting sRGB color values as if they were Linear RGB colors. To check, does the issue look like you have an image like this:
but OpenIV displays it like this?
If so, there are a few different approaches I can think of.
- If you’re saving using BC4-BC7, does it work if you save using BC1 (if the image has no transparency) or BC3 (if the image has transparency) instead?
- If you’re using BC7, my guess is that because we save using the DXGI format
DDS10_FORMAT_BC7_UNORM(because some DDS readers don’t supportDDS10_FORMAT_BC7_UNORM_SRGBand storing sRGB data in_UNORMis more common than storing linear data in_UNORM), OpenIV might be interpreting the colors in the file as linear instead of sRGB. With BC1-BC3, the Exporter will output a DirectX 9-style DDS file instead, which OpenIV will probably read correctly.
- If you’re using BC7, my guess is that because we save using the DXGI format
- If you’re saving using BC1-BC3, does checking the “DDS: Use DXT10 Header” box at the bottom of the left pane make a difference?
- Finally, if neither of those work, we added an sRGB To Linear effect in the version of the Texture Tools Exporter. This should make the image darker and counter the brightening you see in OpenIV. However, you’ll probably see color banding in dark areas when you load it into OpenIV — so if the first two ideas work, they’ll probably produce better results.
Thanks!