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Export tiff with alpha

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I'm trying to understand Affinity photo and having something of a hard time.  I have a tiff file that I've worked on and have made a brush mask using the Selection Brush.


How can I export this as a tiff and include the brush mask as an alpha channel?

Grumpy, but faithful (watch out all you cats)

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Affinity Photo doesn't currently support writing Alpha for .Tiff files. It is something that was included before but has been taken out of the app so that it can be revised. You can see an official post from one of our developers regarding this here.



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