If you mean banding - no, since TG internally uses 32 bits per pixel for image output, all data is there at any time and the post production options just change how they're displayed. The cool thing is that by using different color temperatures, tone curves, contrast etc. you can quickly turn colors towards a violet sunset - just as an example - without having to render, save, open in PS, go back to TG, change settings, render, save etc. It saves a lot of time that way and is super nice to have as a creative tool. It's probably a fair amount of work but it's really a standard for most render engines already.