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Thread: resize picture

  1. #1

    dnbreaks's Avatar
    Member Since
    Jun 01, 2012
    resize picture
    I remember sometime ago I had a picture that was few MB in size and I resaved it so the file size was around 40kb. When I was resaving it I recall seeing and using a horizontal slider, that, as I moved it from side to side it showed what the resulting file size would be. I can no longer find where I used that, but found it to be a useful tool. Does anyone know what I am talking about and where it is?


  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    You may have been using the Preview application on your Mac. Have you tried it again with Preview? (You may have also been using iPhoto.)

  3. #3

    dnbreaks's Avatar
    Member Since
    Jun 01, 2012
    I don't use iPhoto for anything so I tried Preview again. When I click save as and choose JPEG as the format, the slider is there, but I don't see the changing file size like I described in orig post. Could my "issue" have anything to do with moving from 10.6 to 10.8? I did that just a few months ago.

  4. #4

    TattooedMac's Avatar
    Member Since
    May 19, 2009
    Waiting for a mate . . .
    21" iMac 2.9Ghz 16GB RAM - 10.11.3, iPhone6s & iPad Air 2 - iOS 9.2.1, ATV 4Th Gen tvOS, ATV3
    Quote Originally Posted by dnbreaks View Post
    Could my "issue" have anything to do with moving from 10.6 to 10.8? I did that just a few months ago.

    Could well be. Its been that long since i have used 10.6, but i can vouch for what you are doing is correct and will significantly reduce the size of the image. Best thing is give it a go and then Get Info on the image to check if the size is what you want, ie ~ If you need it to fit in some Forums ridiculous size rules on their images M-F not included
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  5. #5

    Member Since
    Feb 02, 2010
    27" iMac, 13 MacBook Pro, 11" MacBook Air, 64G iPad, iPhone 4
    I think you are misunderstanding the reason for the slider in Preview. It is there to select the JPEG quality (or JPEG compression) not the picture file size. Clearly, if you have a high quality and resave it as a lower quality he result will be s smaller file but if it is already low quality it won't change.

    I have checked my answer is correct by taking 260 KB graphic and resaving it as the lowest quality. The resulting file is 57 KB. Resaving the new file as the lowest quality still results in a file of 57 KB. Resaving the small file as the highest quality takes the file up to 319 KB but the picture is now no better than the small file as the computer cannot add detail that was not there.

    The only real way to make a picture file smaller that is already at maximum compression is to make the picture itself smaller - which you can also do in preview.
    Andy C
    27" iMac (2102), 11" MacBook Air (2011), iPad Air, iPad Mini, Apple TV2, iPhone 6 Plus, iPod Classic 120Gb, Ipod Touch, Watch.

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