Well "correct" in the case of linear vs non-linear luminance is pretty much exactly about perception (or at the very least, working to prevent perception differ

Well "correct" in the case of linear vs non-linear luminance is pretty much exactly about perception (or at the very least, working to prevent perception differences further down the pipeline), even if it is a somewhat minor effect. "The Importance of Being Linear"[1] which just came up on HN a few days ago, discusses some issues with non-linearity, specifically in the context of 3D rendering. [1] - http://http.developer.nvidia.com/GPUGems3/gpugems3_ch24.html http://http.developer.nvidia.com/GPUGems3/gpugems3_ch24.html