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I'm using Gimp and I need to save a tiff file with a "Group 4 Fax" compression. I've followed the instructions to have that option enabled on the "Save as Tiff" dialog (see bottom of the linked page), but the option still appears grayed out...

Any idea what I may be doing wrong?

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up vote 3 down vote accepted

Group 4 Fax compression only applies to bitmap (1 bit per pixel) images. Change the image to bitmap, then the option should be available.

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