[Image-SIG] Manipulating JPEGs w/out decompressing?

Chris Barker Chris.Barker at noaa.gov
Mon Jan 26 12:54:22 EST 2004

HI all,

is it possible , with {PIL (or any other Python-based tool) to do simple 
manipulations to a JPEG, without decompressing it. What I'm imagining is 
  simply rotation and cropping, at the moment.

My understanding of JPEG compression is that if you compress and 
de-compress multiple times, more information is lost each time. If I 
understand this right, it seems a shame to degrade an image just to 
rotate or crop it.

As an example, I'm imagining a python version of jpegr jpegtrans/jpegcrop:




Christopher Barker, Ph.D.
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Chris.Barker at noaa.gov

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