Ganimed Options
Use Options > Image Type to select either GIF or PNG.
GIF comes with these options:
Colour quantizer
There´s still only 'Median Cut' so there´s nothing to select. I intend to add 'Octree', but that´s not really on top of my list :-)
Dithering
To be honest all those algorithm look quite the same. Some are made for better performance, which also is hardly noticable on today´s computer hardware. Some comparsions should follow some day.
PNG comes with some additional options:
Please see the APNG-builder Wiki for more details.
Some hints concerning filesize:
- GIF is most likely smaller when PNG uses 24bit truecolour (lossless)
- When converting PNG to 256 colour palette, like GIF, then PNG is most likely smaller...
- ...but GIF allows a colour palette for each single image while PNG only allows one palette for all images, so depending on the image source, GIF image quality might be slightly better.