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Originally Posted by scissors
Wouldn't this be useful for news recipes that grab lots of photos - which will only be displayed on B&W e-ink devices?
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I assume you are trying to save space?
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Could this command be added Kovid?
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I've used ImageMagick in recipes (calibre.utils.magick import Image) to rotate images. I'm not familiar with how much of ImageMagick is supported in Calibre, but there are sepia tone and grayscale separation commands in ImageMagick that might already be supported?