Use sips to pad just the top of an image

Question

I'm trying to add padding to the top of an image using the command line.

I've found the sips command and I've tried

sips --padToHeightWidth 1300 1920 image.png

on an image which is 1920 x 1080.

However this adds 50px of padding to the top and bottom.

Is it possible to just add 100px of padding to the top?

Is there another tool I should/could be using to do this?

Answer 1

I do not believe you can do that with sips. I would recommend ImageMagick which you can easily install using Homebrew. Then the command is:

convert  InputImage.jpg -background blue -splice 0x100 PaddedResult.jpg

If you want to add transparent padding, use:

convert  InputImage.jpg -background transparent -splice 0x100 out.png

If you want to composite two images together, you can do this:

convert -size 1024x768 xc:blue 1024x768.jpg                    # create big blue image
convert -size 100x100 xc:red 100x100.jpg                       # create little red image
composite -gravity northeast 100x100.jpg 1024x768.jpg out.jpg  # superimpose top right

Note that I am creating my images first, you can obviously just use your own.