February 2006
Intermediate to advanced
826 pages
63h 42m
English
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PNG Compression
The most notable aspect of PNG compression is that it is “lossless,” meaning no information is lost in the compression process. A decompressed PNG image is identical to the original.
PNGs use a “deflate” compression scheme (the same engine used to “zip” files with gzip, WinZip, and similar programs). Like GIFs, PNG’s compression works on rows of pixels, taking advantage of repetition in bytes of information. By use of internal filters , it can take advantage of some vertical patterns as well. PNG’s compression engine typically compresses images 5 to 25% better than GIF (and up to 39% better under optimal conditions). Not all tools implement PNG compression to its full potential. See "Creating PNG Files" later in this chapter.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.