Crop a PNG image to its minimum size

Question

How to cut off the blank border area of a PNG image and shrink it to its minimum size using Python?

Answer 1

PIL's getbbox is working for me

im.getbbox() => 4-tuple or None

Calculates the bounding box of the non-zero regions in the image. The bounding box is returned as a 4-tuple defining the left, upper, right, and lower pixel coordinate. If the image is completely empty, this method returns None.

Code Sample that I tried, I have tested with bmp, but it should work for png too.

import Image
im = Image.open("test.bmp")
im.size  # (364, 471)
im.getbbox()  # (64, 89, 278, 267)
im2 = im.crop(im.getbbox())
im2.size  # (214, 178)
im2.save("test2.bmp")