I have a very smooth horizontal gradient in Photoshop, 427 pixels wide. As soon as I choose to Save For Web, the preview shows pretty severe banding in the gradient, even with PNG-24 selected.
Dither doesn't change anything, adding noise to another channel doesn't seem to do anything... I've tried Googling for tips and tricks, but nothing's worked so far (or maybe I'm just doing the tricks wrong). Help!