well, as I hope some members will note, Alex tested some of my 16-shades-of-gray PNGS on several readers, and got mixed results.
I had always been under the impression that if a reader could render 256-colors, it certainly should be able to render 16-colors.
I would surely appreciate if some more folks could do some testing, both with the epub I attached to the first post, and with some other 16-shades-grey pngs. Maybe my graphics editor does something weird to that particular combination (PaintShop Pro, v 9)
I hope to hear from some of you, and try to track down where the problem is centered.