Strange that you mention GIF but don't call it evil.
Reducing a general image to GIF format is usually far
more lossy than compressing it as JPEG, due to GIF only
having at most 256 colours. Furthermore, GIF is evil due
to its licensing. The announcement of Unisys to start
charging for the production of GIF is what caused PNG to
be created. PNG is a replacement for GIF - not for JPEG.
JPEG itself isn't evil. The lossy compression is usually
not something you notice, as long as you stick to the domain
JPEG was invented for: pictures. GIF and PNG shine where
JPEG doesn't: images with a low number of colours, images
with sharp boundaries between very different colours, etc.
So, typically things as drawings, icons, plots, etc.
Abigail
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