PureBasic Forums - English

Heya Fred,
how hard would it be to add that?
PNG has 0-9 as compression level.

What does the current implementation use?
I found no info on wether the current one uses level 9
or something lower. (I know many programs default to level 6 or similar)
If PureBasic's implementation allready uses PNG level 9 compression
then I'm allready happy as max compression is what I want.

But if level 9 is not the default then I'd like to be able to specify it
in SaveImage()

Yes, it uses the Z_BEST_COMPRESSION level, which is the maximum one AFAIK.

Thanks, I've been curious on that for a long time

And what about filtering?
http://www.libpng.org/pub/png/book/chap ... ch09.div.1


@Fred:
Would be easy to add a 1bit/8bit transparency to the saved PNG image, giving an additional bitmap (one for colors and one for transparency) when saving?

Asuming Fred uses the official spesification, then the filtering is done automatically by te compressor.
Fred can probably clarify this, but I think that the higher PNG levels uses the filtering while the mid levels don't etc. or to a lesser degree.