Say I have a large 800x5000 image; how would I split that into 5 separate images with dimensions 800x1000 using the command line?
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2Please don't add the solution to your Q. Mark the answer below as accepted.– slm ♦Nov 23, 2014 at 14:03
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4 Answers
Solved it using ImageMagick's convert -crop geometry +repage:
convert -crop 100%x20% +repage image.png image.png
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4If you want to apply this to a batch of files, try this:
ls -1 *.png | sed 's,.*,& &,' | xargs -n 2 convert -crop 100%x20% +repage– JPTFeb 28, 2019 at 20:55 -
2Okay, so
100%x20%splits vertically and20%x100%splits horizontally.– deadfishMar 9, 2020 at 14:23 -
To place the exports in a subfolder, create that folder and add it to the "sed" part of the command:
ls -1 *.png | sed 's,.*,& subfolder_name/&,' | xargs -n 2 convert -crop 100%x20% +repage– Tin ManOct 12, 2022 at 9:10 -
To split a scan of two pages, I had to use the option
-deconstruct. Without it one of the two files came out as the original with one side blank. Feb 7 at 13:32 -
Using ImageMagick:
$ convert -crop 800x1000 image.png cropped_%d.png
Will create a sequence of files named cropped_1.png, cropped_2.png, and so on.
References
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The OP said that this solved it using
convert -crop geometry +repage. For example:convert -crop 100%x20% +repage image.png image.png.– slm ♦Nov 23, 2014 at 14:06 -
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1@CMCDragonkai it's essentially the same, they're using percentages so it will split any size image into 5 vertical slices instead of being written specifically for the 800x5000 case– outlyerApr 22, 2019 at 21:15
Using the "tiles" functionality:
convert image.png -crop 1x5@ out-%d.png
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1Newer docs: imagemagick.org/script/command-line-options.php#crop ('You can add the @ to the geometry argument to equally divide the image into the number of tiles generated.') Dec 30, 2020 at 11:40
ImageMagick would crash on me, for the image being too big for it to handle, so I had to resort to other methods.
I ended up using the Python Image Library.
A quick and dirty answer to the OP question follows:
from PIL import Image
im = Image.open("YourImage.yourformat")
for h in range(0, im.height, 1000):
nim = im.crop((0, h, im.width-1, min(im.height, h+1000)-1))
nim.save("PartialImage." + str(h) + ".yourformat")
The above code has the final sizes hardcoded, but it can be easily transformed into an full blow script of its own with all inputs parameterized. If one ever needs such a thing.
