Re: JPEG lossless operations?

Ofnuts <ofnuts@xxxxxxxxxxx> · Thu, 31 May 2012 01:04:26 +0200



    On 05/30/2012 05:55 PM, Bruce wrote:
    I've read that Picasa (Google's program) might be able
      to perform lossless rotations, but I'm just going by what I've
      read. (Source) 
      
        
      Apparently there are ways to test if the tool you use makes
        use of lossless rotation. This page lists some: 
        http://www.impulseadventure.com/photo/lossless-rotation-test.html 
      

      This page also has a nice explanation of lossless rotation
        and its finer nuances:
      http://www.betterjpeg.com/lossless-rotation.htm
      
      
      From what I've learned so far, I think in the end you just
        have to relax about all this stuff and not worry about it too
        much, though it does help to know what's happening when you do
        certain things (such as rotate a jpeg). 
      

    The best (and fastest....) way to rotate a JPEG is to change its
    orientation flag...

    
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