I've noticed that on my rMBP, when I try to make a screenshot smaller using Preview.app version 6.0.1 (Tools -> Adjust Size).

When I'm trying to decrease the image size to upload it, the file size often increases.

Compare these two files:

  • The first one is 3.3MB. Resizing it to 70% of the resolution results in a file size of 2.1MB.

  • The second one is actually a screenshot of the first image. It's 4.5MB, but again resizing it to 70% results in a file size of 5.2MB. Resizing it to only 99% results in nearly double of the size (8.6MB).

How can this happen? What is going on here?

  • Are you resampling the image when you change it's size within preview? – bmike Apr 30 '13 at 16:38
  • I'm sorry, what do you mean? The only thing I do is open the Adjust Size dialog, change the metric to percent, adjust the size and confirm it, and save the file. – Redrick Apr 30 '13 at 19:23

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