Drawing on TIFF with Alpha Channel enabled

Discuss digital image processing techniques and algorithms. We encourage its application to ImageMagick but you can discuss any software solutions here.
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mackermedia
Posts: 15
Joined: 2013-01-25T12:59:01-07:00
Authentication code: 6789

Drawing on TIFF with Alpha Channel enabled

Post by mackermedia »

I am working to use mogrify to modify a source template image to do a number of different operations: add background color, add text, add image, etc.

I have the operations working successfully when I start with a source tif that is all white and has no Alpha Channel enabled.

I now want to be able to start with a fully transparent source template file, apply any of the operations, and save a new image with transparency.
The problem is, now that I'm starting with a fully transparent image, none of the same operations are affecting the image. The output is always the same fully transparent image.

Do I need to do some conversion of the source file before attempting modifications? Should I be starting with a different source template file and converting to TIFF at the end?

Any help will be greatly appreciated.

mackermedia
Posts: 15
Joined: 2013-01-25T12:59:01-07:00
Authentication code: 6789

Re: Drawing on TIFF with Alpha Channel enabled

Post by mackermedia »

Turns out, simply starting with a fully transparent .png image and applying the operations, then saving as .tif works like a charm.

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