I thought about that more Ulco.
The problem is probably if there isn't any difference it won't be much a help too .
You use Lightwave too.I read that years ago 256 color images were used in production too.
Especially memory wise.
From a distance and depending on the image it is hard to see.
I only saw it when i wanted to try some editing for fun on it
@N-drju : It was about that his image is an indexed
one.It does have only 256 colors.
Not a PNG specific thing only.