remove-alpha-channel.md

Remove alpha channel from app icon

According to Apple's Human Interface guidelines, transparency is not allowed in app icons.

There are a variety of ways to remove transparency from your app's icon.

Using Preview app (Mac)

• Open the image in Preview
• File > Duplicate (Command-Shift-S)
• File > Save (Command-S)
• In the save dialogue, deselect the "Alpha" checkbox
• Delete " copy" from filename (including the space)
• This will overwrite your original, if you want to keep the original, just leave "copy" in the name or name it something else.
• Save
• Click 'Replace' to confirm you want to overwrite the original (Only necessary if you are overwriting your original)

Using Alpha-Channel-Remover App (Mac)

If you have many images to process you may want to use an open source program to remove alpha channels.

Find Alpha-Channel-Remover on GitHub here, and download it here

Using ImageMagick

ImageMagick is a command line utility for editing images.

• Run brew install imagemagick
• Then run convert <ORGINAL_IMAGE_NAME>.png -background black -alpha remove -alpha off <OUTPUT_IMAGE_NAME>.png.

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Once you've removed transparency from your app icon, rebuild your app.