The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Use Pillow’s Image.crop() method to select a rectangular part of an image. Pass the crop boundaries as (left, upper, right, lower), then save the returned image.
Crop an image with Pillow
Install Pillow if it is not already available in your Python environment:
python -m pip install PillowThen open the image, crop it, and save the result:
from PIL import Image
with Image.open("input.jpg") as im:
cropped = im.crop((100, 50, 400, 250))
cropped.save("cropped.jpg")This selects the rectangle between x-coordinates 100 and 400 and y-coordinates 50 and 250. The output is 300 pixels wide by 200 pixels high. Pillow documents cropping as extracting a rectangular region; the Image module reference documents the crop() method.
Understand the crop coordinates
The image origin, (0, 0), is at the upper-left. The crop box is (left, upper, right, lower), not (x, y, width, height). Its boundaries specify the rectangle to select; subtract the left boundary from the right for the width, and the upper boundary from the lower for the height. Pillow’s tutorial notes that coordinates refer to positions between pixels, so a box of (0, 0, 64, 64) selects a 64-by-64 region.
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If your starting values are an origin plus a desired width and height, calculate the right and lower boundaries:
from PIL import Image
x, y = 100, 50
crop_width, crop_height = 300, 200
box = (x, y, x + crop_width, y + crop_height)
with Image.open("input.jpg") as im:
im.crop(box).save("cropped.jpg")Choose a target-size operation when needed
A crop selects a region from the source. If your real goal is to produce an image with a prescribed size or aspect ratio, Pillow’s ImageOps module also provides fit, contain, cover, and pad. Their behavior and parameters differ, so consult the ImageOps reference for the target dimensions and resampling details relevant to your case.
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Or skip the browser setup
If the image you need is a webpage, a screenshot API can return a capture directly rather than requiring you to open a browser and crop a saved screenshot. For an ordinary image file, Pillow remains the direct crop tool.
ScreenshotNeo is a website screenshot API and MCP server. A single request can save a webpage capture; see the ScreenshotNeo documentation for request options.
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