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Preview has had the capability to remove the alpha channel from an image. See Remove alpha channel in an image

Preview 9 (OS 10.12.4) does not appear to have the alpha channel toggle box. Can someone recommend a method for deleting the alpha channel from an image in Preview 9?

Community
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OldGuy
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1 Answers1

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Exporting to jpg should lose the alpha channel even though there isn't any toggle box, but doing so results in a small amount of quality loss.

To avoid that you can use free image editing applications as gimp.

eli-bd
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