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I have a bunch of 1800x1800 pictures. I need to individually put each image onto a 2200x2200 canvas and then save/export it. Is there a way I can batch this?
To further explain, I need to add a 400 pixel white trim to each side of each picture. Right now I'm using gimp and I'm making a new canvas that's 2200x2200 and adding the picture as a layer and then exporting, and then repeating for each one.
Is there a way that I can automate this or do this multiple pictures at once?
With ImageMagick, as simple as
convert Source.png -bordercolor blue -border 400 Target.png
if needed you can define different H/V borders:
convert Source.png -bordercolor blue -border 200x100 Target.png
Depending on IM version, convert can also be magick or magick convert
If you want to update the original images then use
[magick] mogrify -bordercolor blue -border 100 Image.png
This form makes it simple to update several images in one command(*):
[magick] mogrify -bordercolor teal -border 100 Image*.png
(*) One can also use wildcards with [magick] convert but the syntax to generate the proper output name is a bit contrived. But you can also of course make a loop in a shell script instead.
I used Meitu app, which supports batch processing to make photos at the same size.
