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PIL read-only image support for Microsoft Windows .ico files.
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The info dictionary has a key 'sizes' that is a list of the sizes available
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Handles classic, XP and Vista icon formats.
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image to "RGBA" mode before saving.
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This plugin is a refactored version of Win32IconImagePlugin by Bryan Davis
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<casadebender@gmail.com>.
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https://code.google.com/archive/p/casadebender/wikis/Win32IconImagePlugin.wiki
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