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Q: Why does exporting change file size?

Is there any way to export modified photo (info added) without making it take more space? Somehow "Jpeg quality" setting messes up file size even if I don't edit images in any way. Can't it look at the original and choose quality automatically? Also, what "most compatible" color profile will do differently compared to "original"?

MacBook Air, macOS Sierra (10.12)

Posted on Sep 26, 2016 12:56 AM

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Q: Why does exporting change file size?

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  • by Dmeet,

    Dmeet Dmeet Sep 26, 2016 1:20 AM in response to Dmeet
    Level 1 (10 points)
    Mac OS X
    Sep 26, 2016 1:20 AM in response to Dmeet

    Or maybe there are other ways to slap description, keywords, faces and locations on the original file, with the ability to browse these files in finder afterwards.

  • by léonie,Solvedanswer

    léonie léonie Sep 26, 2016 1:34 AM in response to Dmeet
    Level 10 (108,058 points)
    iCloud
    Sep 26, 2016 1:34 AM in response to Dmeet

    Is there any way to export modified photo (info added) without making it take more space? Somehow "Jpeg quality" setting messes up file size even if I don't edit images in any way.

    If you notice, that the exported JPEGS file is much larger when exported with JPEG quality "Maximum", use "JPEG Quality Large".  "Maximum" is only useful, if the original JPEG used this compression setting, but most JPEGs taken with my digital cameras are having a file size hat corresponds better to "Large". You should also use "Maximum", if you want to add more edits in an external editor. Each compression step will be reducing the quality. As long as you want to edit the photo, keep the quality at maximum, and save the final version with "Large".

    Also, what "most compatible" color profile will do differently compared to "original"?

    Whenever I am using this setting for my photos, the original color profile will be replaced by an sRGB IEC61966-2.1 profile.  It might be different for scanned photos, but I have not tested it.