Python script to trim all png images with white background in a folder

PNGWhiteTrim.py

import Image
import sys
import glob
import ImageOps

# Trim all png images with white background in a folder
# Usage "python PNGWhiteTrim.py ../someFolder"

try:
    folderName = sys.argv[1]
except :
    print "Usage: python PNGWhiteTrim.py ../someFolder"
    sys.exit(1)

filePaths = glob.glob(folderName + "/*.png") #search for all png images in the folder

for filePath in filePaths:
    image=Image.open(filePath)
    image.load()
    imageSize = image.size
    
    # remove alpha channel
    invert_im = image.convert("RGB") 
    
    # invert image (so that white is 0)
    invert_im = ImageOps.invert(invert_im)
    imageBox = invert_im.getbbox()
    
    cropped=image.crop(imageBox)
    print filePath, "Size:", imageSize, "New Size:", imageBox
    cropped.save(filePath)

Hey, thanks for the code, it was helpful! Ive modified it a tiny bit so you can use padding:

from PIL import Image # pip install Pillow
import sys
import glob
from PIL import ImageOps
import numpy as np


# Trim all png images with white background in a folder
# Usage "python PNGWhiteTrim.py ../someFolder padding"



try:
    folderName = sys.argv[1]
    padding = int(sys.argv[2])
    padding = np.asarray([-1*padding, -1*padding, padding, padding])
except :
    print("Usage: python PNGWhiteTrim.py ../someFolder padding")
    sys.exit(1)

filePaths = glob.glob(folderName + "/*.png") #search for all png images in the folder

for filePath in filePaths:
    image=Image.open(filePath)
    image.load()
    imageSize = image.size

    # remove alpha channel
    invert_im = image.convert("RGB")

    # invert image (so that white is 0)
    invert_im = ImageOps.invert(invert_im)
    imageBox = invert_im.getbbox()
    imageBox = tuple(np.asarray(imageBox)+padding)

    cropped=image.crop(imageBox)
    print(filePath, "Size:", imageSize, "New Size:", imageBox)
    cropped.save(filePath)

So if you want to trim it but leave some padding (lets say of 10), you just do:
python PNGWhiteTrim.py ../someFolder 10
also added the brackets for python3 and added comment for installing Image module :)

Thanks!

Well done, thanks!

Great script! Thanks!

Thanks! This is great!

Code not working for the following image:

Any ideas why?

Thanks a lot, it works great for my case.

Has anyone considered this answer as well? Just checking if there is a unified answer between sites

• https://codereview.stackexchange.com/a/212555
• https://stackoverflow.com/a/76727053
• https://stackoverflow.com/a/20557549