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Lossless JPEG Crop

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Lossless JPEG Crop Krishnan B 04 Apr 14:21
  Lossless JPEG Crop Jeffrey Brent McBeth 04 Apr 16:30
Krishnan B
2005-04-04 14:21:18 UTC (almost 20 years ago)

Lossless JPEG Crop

Is it possible in Gimp to crop a part of a JPEG image and save it as another JPG without loosing on quality ?
If I use a quality factor of 100% ( Excellent quality), the cropped image has a bigger filesize than the original image !!

Krishnan

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Jeffrey Brent McBeth
2005-04-04 16:30:39 UTC (almost 20 years ago)

Lossless JPEG Crop

Your best bet for a lossless JPEG crop is to use ImageMagick or the JPEG utils rather than GIMP. IIRC, there has been talk about allowing GIMP to do the few lossless JPEG transforms that are possible, but I haven't seen patches or release notes to the effect. something like

jpegtran -perfect -crop 50x50+23+10 input.jpg output.jpg

Would do the trick

BTW, even the guys that designed the JPEG library say that 100 should never be used (and it doesn't mean what everybody thinks it means either)

Jeff