Drahken wrote:2) The compression setting in PNG is merely a tradeoff between filesize and speed. You should never use 0 compression, as it does not decrease compression time at all vs a setting of 1 (technically, it would have to, but it would only be in the range of about 1 bilisecond), yet results in a massive file. (0 level PNGs are slightly larger than even the bloated BMPs, because they also have no compression, plus they have some extra headers.) Level 6 is the standard/default setting, 9 gives slightly smaller files, but can be noticeably slower (especially on large images).
Today saved a black on white diagram (1150 x 775 pixels) - with some halftone edges - and found that contrary to posts dating from five years ago the file now indeed gets smaller with each higher compression level.
One wonders whether there would be an option to include a bit of explanatory text on the save > options page, perhaps a table indicating how small and how long a line diagram and a photo would take at each setting, and especially stating that all you're selecting is the compression level?
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