elroyflynn

Yes, I'm asking technical. Is it a parameter to the jpeg algorithm? or is it doing some kind of pre-processing that results in better compression? For example, it making be making nearly-identical colors actually identical, so that jpeg will compress more.

In the file/save dialogue, the quality slider: Obviously it can be used to reduce image quality, resulting in a smaller file size, but what is it doing? Thanks, Elroy