David Elliott has an interesting video that demonstrates just how lossy the JPEG format really is. The UCLA MFA candidate chose an image and saved it repeatedly -- 600 times, to be exact -- ratcheting up the compression each time. He's posted the results as a 20-second clip on Vimeo. Very cool; check it out. (HT Laughing Squid)
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JPEG is so ghetto.
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|No, that honor belongs to .gif.
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|It really depends on the application still. For something like a large image that won't change much (like a large web background or header), .jpg is still fine. For everything else, .png is perfect.
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|no surprises there, an interesting read.
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|haha, i don't know how this surprised anybody... but i guess its somewhat interesting, how to avoid? dont waste your time by saving a jpg 600x ... wonder what happens when you reencode an mp3 the same way? :D http://www.sendspace.com/file/1l64x5 lol
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|You, uh, did see the part in there about Mr. Elliott working on his MFA, right? Honestly, I swear some days the commenters just refuse to read for comprehension...
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|i was just kidding about the wasting time part =P i waste more time here...
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|Anyone with an image program has done this with filters.
Hey Angela! Welcome to computerland!
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|Hey MJM, glad to be here. Really, you've also done an art project that involved saving an image 600 times in order to show the effects of lossy compression? I'm impressed that anyone can find the time to do that sort of thing and still make dim comments like the one above. You're so multitasked! :-D
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|It's kind of silly, because you would never transcode something 600 times or even 3 times. This shows why you should try to compress to the desired compression level from the original lossless image format rather than try to recompress an already compressed file.
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|Or just stick with lossless compression formats like PNG, unless the JPEG is much smaller and the quality difference is negligible. Usually just applies to really complex images like photos. Even with JPEG quality at 100 (which FYI is NOT lossless, there's still lossy compression) a JPEG can still be a lot smaller than a PNG with the right image.
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|Yeah, but PNG is 8-bit. PNG-24 tends to be larger than JPG. So there's really a point to everything.
I think that it would be nice if JPEG's contained information within their meta tags about how many times the image had been resaved... although, someone using a screen capture would obviously invalidate that data...
There's just a point to all image formats really... except gif. And nobody say GIF animation.
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|Actually my comparison was based on 32-bit PNGs (or 24-bit without 8-bit alpha channel).
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