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The Preview tool on Mac OS X adds transparency during resize!

Steps to reproduce:

  1. Save the following image. It doesn't contain transparent colors and color profiles. enter image description here

  2. Open it in Finder by double click.

  3. Resize it to 144 pixels using opened Preview tool.

You will get transparent image. You can check transparency on Photoshop. You will see the following result:

enter image description here

Why does this happen? Only some colors raise the issue.

AStopher
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Dmitry
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  • it doesn't get transparent on my Mac OS X 10.10.1, Preview 8.0 (859) – cello Nov 21 '14 at 10:15
  • I have Preview 8.0 (859) too. And I double checked - the issue presets. Did you check the result image on Photoshop? You can see background pattern as prove of the transparency. – Dmitry Nov 21 '14 at 10:25
  • I checked in GraphicConverter. The Alpha channel is completely black. – cello Nov 21 '14 at 10:26
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    This question appears to be off-topic and better asked at http://apple.stackexchange.com/ ; it has nothing to do with programming. –  Nov 21 '14 at 10:35
  • cell, but please check it in Photoshop. Why the image is transparent on Photoshop? – Dmitry Nov 21 '14 at 10:42
  • Evert, any programmer needs correct icons for his apps. – Dmitry Nov 21 '14 at 10:43
  • @Altaveron Yes, ***but this question is still not about programming***. I've voted to close. – AStopher Nov 26 '14 at 11:26

1 Answers1

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It look like Photoshop shows transparency on the file without it. So, it's Photoshop issue. As it work very wrong if you select "don't control color profiles" during file opening.

Dmitry
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