[Gimp-user] Remove parts of image from multiple images

I am not cropping, I am removing specific parts of images (let's say a
triangle) i.e. turning it transparent. The specific parts needs to be
removed are same for all images.

I could do it manually for each image, but there are just too many of
them (was a video converted to frames)

Is that area static, if it varies then I think not possible.

Nothing easy in Gimp I can think of to batch process a set of frames. You will
need a script/plugin writing.

As a possibility, using ImageMagick and a couple of commands.

overlay each frame with a mask, choose a colour that does not normally occur in
the frames, say magenta

magick composite area.png image.000075.jpg  out-xxx.png

Make that overlay colour transparent

magick out-xxx.png  -fuzz 40% -transparent magenta result-xxx.png

Of course that is just for a single frame, those need wrapping in a batch/bash
script depending on OS.

Best place to ask the question is https://www.imagemagick.org/discourse-server/
in the Users section

* http://www.gimpusers.com/system/attachments/1027/original/01-trans-area.jpg
* http://www.gimpusers.com/system/attachments/1028/original/02-trans-area.jpg

rich404 (via www.gimpusers.com/forums)

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