Adobe Digital Editions and PNGs

[Land_Outcast]

Does anyone know a way to correctly display transparencies in ADE?
My PNGs and GIFs end up looking like the attached image.

[hobnail]

Not the answer you're looking for: Isn't the page's background white with ADE? If that's so then why not get rid of the alpha channel and use a white background with your PNG or GIF?

[Land_Outcast]

Just found this:

The (at least) desktop version of ADE will not display PNGs correctly that have a bit depth less than 8. They instead look very strange, like a linescreen has been applied to them.

Source 1

Also this:

reduced-color png brings us back to square one ---- the ADE engine in some devices can not properly render 2-bit (2-colors) or 4-bit (16 colors).

So it looks like being stuck with either 8-bit 256-color png with its larger file-size, or with crushed jpegs in 256-greyscale, smaller files but compression artifacts.

But the 256->16->256 png makes a pretty small file, so probably would be the way to go with images with low color count.

Source 2

But my PNGs are already 8-bit, so I don't quite get what is happening.

Usually the disappearing pixels are on an extreme of the dynamic range (either the brightest or the darkest), but sometimes it is not the case. I observed, though, that low-contrast PNGs almost don't suffer this, so I'll see if reducing the color range solves anything.

[Land_Outcast]

Yep, that solved it.
Mid or low contrast PNGs work just ok in ADE.