locked
Windows Explorer Based JPEG Rotations Are NOT Lossless RRS feed

  • General discussion

  • Some inexpensive digital cameras don't have a rotation sensor.  No matter - in Windows Explorer, you can rotate JPEG images by right clicking on them then choosing Rotate clockwise or Rotate ounterclockwise from the context menu. 

    You'd think.

    Trouble is, Windows decodes the JPEG, then recompresses it, lowering the quality of the image!

    How to properly do a lossless JPEG rotation has been known for many years.  Just some data fields in the EXIF have to be changed.  Many tools, even some free ones, do it.

    Microsoft, please consider recoding the Image Rotation feature of Explorer to do lossless rotations!

    -Noel

    Friday, May 13, 2011 8:03 PM