MicrostockGroup

The same occurs with over whites, and to be honest, I never checked that before. Below is the edge of a small red Chili pepper over white (RGB 255,255,255) in a food shot at 200%, in Photoshop CS3, the white selected by magic wand tolerance 0, no anti-aliasing, not contiguous.

The left clip is the 16-bit TIFF, the right clip is the 8-bit jpg saved in top jpg quality 12, and converted to 8-bit right before saving: I do all my image processing in PS at 16-bit, and I start from RAW. Clips are 200%.



Part of the jpg compression algorithm uses dithering around edges, and that is what we might see here. Good work from the reviewers, I never thought about that. I think it's simply unavoidable using the jpg compression algorithm.

Pretty obnoxious for designers though if they have to redo the isolation. Maybe include the clipping path in the images? I never understood how to do it, but it's more laziness since there seem to be a few tutorials online.

To photogs that use clipping paths: where can a good tutorial be found, and does the clipping path also contains this kind of compression artifacts?