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  1.    15 Sep 2016 #11
    Join Date : Jun 2016
    Posts : 15
    Win10 64-bit, Win7 (32-&-64 bit) & virtualised XP

    Windows Photo Viewer not a good way to rotate photos, can be lossy

    Though it's now a few weeks after the original post, I'll state this anyway, in case it's of benefit to someone: Windows Photo Viewer is not a good way to rotate photos. If either the height or the width of the picture being rotated are not exactly divisible by 8, Windows Photo Viewer will re-save the pic in jpg format, meaning you lose picture quality, since jpg is a lossy format. Windows Photo Viewer will warn you the first time that you do this on a Windows installation. If you tick the "In the future, do not show this dialog" checkbox, you'll never see the warning again, and would probably soon have forgotten that it still applies.

    Click image for larger version. 

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    Even if your camera's pics all have heights and widths divisible by 8 [for all the pic sizes selectable in the camera's settings], if you crop and save a pic, whether that pic be from your camera or downloaded from the internet, the saved pic might not have height and width cleanly divisible by 8. So you would lose picture definition if you rotated it.

    The preferred solution for many of us is to simply never use Windows Photo Viewer to rotate pics. But if it's the default picfile viewer, it's easy to accidentally click the rotate buttons. So we install a third party freeware program of choice as the default photo viewer. I use Irfanview, which has a Jpg Lossless Rotation feature. Irfanview has both lossless and lossy rotation options, and all programs have a learning curve, so if you adopt this solution be sure to properly study the program help. If you use Irfanview, be sure to download and run the plugins installer after running the main program installer. Also study the program's lossless rotation options, as some of them can remove picture file metadata you'd probably prefer to keep, if not set the way you want.

    These webpages describe some of the issues I've mentioned:

    This Wikipedia table mentions 'JPEG lossless rotate' in the 'Other functions' column for those programs that are capable of it:

    Happy rotating!
    Last edited by bigbadsteve; 15 Sep 2016 at 01:56. Reason: Fixed link.
      My System SpecsSystem Spec

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