bbrooke bbrooke - 4 months ago 49
Python Question

Cropping an image with Python Pillow

I installed Python Pillow and am trying to crop an image.

Other effects work great (for example, thumbnail, blurring image, etc.)

Whenever I run the code below I get the error:


tile cannot extend outside image


test_image = test_media.file
original = Image.open(test_image)

width, height = original.size # Get dimensions
left = width/2
top = height/2
right = width/2
bottom = height/2
cropped_example = original.crop((left, top, right, bottom))

cropped_example.show()


I used a cropping example I found for PIL, because I couldn't find one for Pillow (which I assumed would be the same).

Answer

The problem is with logic, not Pillow. Pillow is nearly 100% PIL compatible. You created an image of 0 * 0 (left = right & top = bottom) size. No display can show that. My code is as follows

from PIL import Image

test_image = "Fedora_19_with_GNOME.jpg"
original = Image.open(test_image)
original.show()

width, height = original.size   # Get dimensions
left = width/4
top = height/4
right = 3 * width/4
bottom = 3 * height/4
cropped_example = original.crop((left, top, right, bottom))

cropped_example.show()

Most probably this is not what you want, but this should provide you a clear idea of what should be done.