In DisplayButtons, Panel "Output", a new slider "Dither" allows to add random noise dither to rendered output. It works on sky as well as solid and transparent. Note however that in OSA render, the Unified Render gives much better results, since that render nicely delivers full scanlines of high definition color. The old render mode isn't well suited for this postprocess. A dither value of '1.0' will exactly add maximum of 1.0/256.0 to the pixels. Potential improvements for next releases; - regular patterns - dither per color channel - not only add, but also subtract dither Also note that this gives best results for print work or stills. Animating it gives slight visible noise. Also runlength compression wont really work, and Jpeg needs to be given higher quality too.