lucio@proxima.alt.za wrote:
> I can only presume that PNG encoders increase the pixel depth, for
> whatever reason.
It offers also at least 8-bit for alpha. In GIF, simply one of the 256
colors is (absolutely) "transparent".
>
> And, BTW, PNG allows 16-bit per colour, a 48-bit depth per pixel.
> Thanks to libpng, my "npng" can render these as 24-bit images.
Oh, I didn't know. Nice feature, according to the usual 48-bit scanners.