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For the lazy - http://jpegmini.com http://jpegmini.com -- I grabbed 4th pair of their demo image [0], the high quality image is about 4.8M, the JpegMini'd v
by huhtenberg 14y ago
For the lazy - http://jpegmini.com http://jpegmini.com
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I grabbed 4th pair of their demo image [0], the high quality image is about 4.8M, the JpegMini'd version - 1.3M.
Then I took the high quality image and started bumping up standard JPEG compression level until I reduced the file size to 1.3M. That mapped to 17/100 setting, with 1 being highest quality, 100 - highest compression).
Then I made an arithmetic per-pixel diff between the original high quality image and two 1.3M versions. Cropped them to 2000 x 2000 and saved as PNGs (cropping is to fit the imgur file size limits). Here they are -
http://imgur.com/1FOwXhq http://imgur.com/1FOwXhq
http://imgur.com/3efRooj http://imgur.com/3efRooj
Now, have a look and tell me that JPEGMini hasn't got something exciting going on.
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[0] http://media.jpegmini.com/homepageImages/20121203/hipnshoot.zip http://media.jpegmini.com/homepageImages/20121203/hipnshoot....
- Xcelerate 14y agoHaha, I only kind of skimmed your post then downloaded that file. I opened the images and was like "I don't know how high-quality this is. The images look exactly the same to me." And then I saw the file sizes and had the ah-ha moment.
- deadairspace 14y agoI don't see much of a difference. Is that the point? Are you saying that JPEGMini are just compressing to ~83% quality?
- huhtenberg 14y agoNo, there is a noticeable difference. JPEGMini diff shows less color fringing (fewer "colored" pixels) and it also appears to better preserve edges and outlines.
- ricardobeat 14y agoJPEGmini better preserves color information, but it doesn't seem to be that much better.
- conroe64 14y agoMaybe I'm not the most knowledgeable guy here, but I really don't see what you're getting at. The per-pixel diffs look nearly the same. I downloaded the "hipnshoot.zip" and yes the photos look identical. But then I fired up gimp and re-compressed the high quality photo to reduce the size even more than the "jpegmini" version, and I can't tell the difference. Here are the file sizes: -rw-r--r-- 1 tim users 4930482 Dec 1 21:22 hipnshoot.jpg -rw-r--r-- 1 tim users 1310430 Feb 26 08:27 hipnshoot_gimp.jpg -rw-r--r-- 1 tim users 1352882 Dec 3 09:16 hipnshoot_mini.jpg I put them here: http://www.rareventure.com/jpegmini/ http://www.rareventure.com/jpegmini/ "hipnshoot_mini.jpg" is the "jpegmini" version and "hipnshoot_gimp.jpg" is the one I compressed with plain old gimp.
- mnicole 14y agoI'm not sure how much it could change anything here, but Imgur also compresses images when uploaded. Maybe try min.us?
- jfb 14y agoPNG is lossless.