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Editorial Team
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Asked: 2026-06-12T17:17:47+00:00

I have been getting this error for 2 days in response to iconutil -c

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I have been getting this error for 2 days in response to iconutil -c icns iconset.iconset:
ImageIO: _CGImagePluginWriteICNS unsupported image size (128 x 128) – scaling factor: 2
ImageIO: _CGImagePluginWriteICNS unsupported image size (16 x 16) – scaling factor: 2
The iconset.iconset folder has 10 .png files icon_512x512@2x.png, icon_512x512.png…and the versions for 256, 128, 32, 16.
The resulting iconset.icns file has only 8 images.
I’m running xcode 4.5 on Lion.
I have searched and searched for an answer. If I just remove the offending 128×128@2x and the 16×16@2x, the message is these files are missing.
Very grateful for any help.

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1 Answer

  1. Editorial Team

    I realized the answer to my question:
    The @2x files should have an image size 2x, e.g. icon_128x128.png has image size 128×128 px, but icon_128x128@2x.png actually must have an image size of 256×256 px.
    When I asked the question, I did not realize this and my image sizes were the same for each pair.
    Hope this helps someone

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