[ThatOtherPerson]

What happens if you need to alter the color of a texture that's been loaded? For example, if you want to do diffuse shading on a sphere with a texture mapped to it. Do you first need to convert the texture pixel back to linear space, apply the shading, and then correct for gamma?

[tomjakubowski]

I believe that, in WebGL, if you sample the texture in a shader the resulting color is in a linear space. And output colors from a fragment shader are meant to be linear as well.

I realize now that I can't fully answer your question, because I'm unsure whether WebGL implementations are supposed to respect color correction information in the image file format. But I'm pretty sure that the color space in WebGL "shader land" is always linear.