Cutting off the top portion of a page

[damonm]

Hey guys, I have searched the forum and found an article on cutting off the bottom 20% of an image but that didn't work for me. I have the image completely cropped and ready to go. This is a landscaped image, and I want to cut off the top 10 or 20% (I'll have to play with it to get it exact). I don't want to cut anything else except the top and I haven't figured out how to do this although I suspect it is pretty simple. Many thanks in advance for your help! I am using ImageMagick-7.0.5-4.x86_64.

[snibgo]

"-crop" will do this, eg:

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convert in.png -gravity South -crop x90%+0+0 +repage out.png

EDIT: Sorry, you use v7, so use "magick" instead of "convert".

[GeeMack]

This is a landscaped image, and I want to cut off the top 10 or 20% (I'll have to play with it to get it exact). I don't want to cut anything else except the top and I haven't figured out how to do this although I suspect it is pretty simple.

There are many ways to go about this, one of the more straightforward methods is by using "-crop" as snibgo described above. You can also use "-chop" or "-extent" just about as simply. Here are a couple of example commands...

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magick image.png -gravity north -chop 0x10% result.png

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magick image.png -gravity south -extent 100x90% result.png

Edited to add: Depending on the level of precision you require, all of those example operations can use fractions of whole percentages. Something like "-crop 100x90.3%+0+0" should work.