And if you don't want to pay the memory/bandwidth costs of doubling your image size, you can keep storing your images in 8 bpc sRGB, but convert from sRGB to linear before blending/interpolation and convert back afterward. Modern GPUs have built-in support for this. There's really no excuse for incorrect blending!
And yet all font rendering on Linux is done with incorrect alpha blending. There are patches for the major toolkits but as anything to do with font rendering, people are very resistant to change.
