Hi, Cairos compositing operations provide a good way of doing this and are available from python via CairoCFFI. They provide a multiply operator http://cairo

Hi, Cairos compositing operations provide a good way of doing this and are available from python via CairoCFFI. They provide a multiply operator http://cairographics.org/operators/ http://cairographics.org/operators/ and others. For an advertising site we needed arbitrary tinting so we lightened the images with Cairo, then added a color mask over the top in the web page. S