How to save a resized image in Python?

Question

Maybe this is because I'm a newby to Python. But I don't seem to be able to resize and save images.

Can somebody help me by telling me what I'm doing wrong here? I'm resizing first, and secondly cropping an image to 256x256. The output is saved as the original image. Function call like: resizeAndCrop("path/to/image.png")

Current behavior is the script saving the image in the original size...

# function for resizing and cropping to 256x256
def resizeAndCrop(imgPath):

    im = Image.open(imgPath)

    # remove original
    os.remove(imgPath)

    # Get size
    x, y = im.size

    # New sizes
    yNew = 256
    xNew = yNew # should be equal

    # First, set right size
    if x > y:
        # Y is smallest, figure out relation to 256
        xNew = round(x * 256 / y)
    else:
        yNew = round(y * 256 / x)

    # resize
    im.resize((int(xNew), int(yNew)), PIL.Image.ANTIALIAS)

    # crop
    im.crop(((int(xNew) - 256)/2, (int(yNew) - 256)/2, (int(xNew) + 256)/2, (int(yNew) + 256)/2))

    # save
    print("SAVE", imgPath)
    im.save(imgPath)

resize() returns a resized copy of an image, so you need to assign the result of the operation otherwise the new image is lost. The same is true of crop() with the added wrinkle that "This is a lazy operation. Changes to the source image may or may not be reflected in the cropped image. To get a separate copy, call the load method on the cropped copy." — Steven Rumbalski
– Steven Rumbalski, Commented Feb 28, 2017 at 18:35
so you are performing crop and resize on the image, but nothing is happening and the same image as the original is being saved? — The4thIceman
– The4thIceman, Commented Feb 28, 2017 at 18:36

The4thIceman · Accepted Answer · 2017-02-28 18:48:36Z

2

As per the documentation: https://pillow.readthedocs.io/en/4.0.x/reference/Image.html

calling resize on an image "Returns a resized copy of this image." So you would need to assign the result to a new variable:

resizedImage = im.resize((int(xNew), int(yNew)), PIL.Image.ANTIALIAS)

and for cropping the same applies, but it is noted in the docs that "Prior to Pillow 3.4.0, this was a lazy operation." So nowadays you will need to assign the call to crop to another variable as well

answered Feb 28, 2017 at 18:48

The4thIceman

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