Adding borders to an image using python

Question

I have a large number of images of a fixed size (say 500*500). I want to write a python script which will resize them to a fixed size (say 800*800) but will keep the original image at the center and fill the excess area with a fixed color (say black).

I am using PIL. I can resize the image using the resize function now, but that changes the aspect ratio. Is there any way to do this?

Answer 1

You can create a new image with the desired new size, and paste the old image in the center, then saving it. If you want, you can overwrite the original image (are you sure? ;o)

import Image  old_im = Image.open('someimage.jpg') old_size = old_im.size  new_size = (800, 800) new_im = Image.new("RGB", new_size)   ## luckily, this is already black! new_im.paste(old_im, ((new_size[0]-old_size[0])//2,                       (new_size[1]-old_size[1])//2))  new_im.show() # new_im.save('someimage.jpg')