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ImageMagick V7 and Cropping Tool – CentOS

I’m trying to crop an image using ImageMagick V7 on Linux CentOS 7 via the following command-line:

$convert -crop 256x256+224+384 test2.png Cropped.png

My input image is test2.png, my output image is Cropped.png. The input image is 480×640, and I want to crop it to 256×256.
The general form of the command-line is given by:

$convert -crop x_sizexy_size+x_offset+y_offset inputfile outputfile

ImageMagick cropping diagram:

ImageMagick Cropping Diagram

My original image looks like this:

Original Image

My cropped image looks like this:

Cropped Image

You can see there’s whitespace in my original image, what I want is to remove that.

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2

Answers


  1. 0

    It works OK for me but your dimensions are a bit off – for the result I think you wanted.

    Note V7 uses magick and not convert; convert uses a V6 legacy version.

    You should read the input image ( in most cases ) before any operation. In V7 if you use the commands in the wrong order it can fail.

    I used:

    $magick test2.png -crop 256x256+224+384 Cropped.png

    In this case if you only wanted to remove the white area you could use -trim:

    $magick test2.png -trim Cropped.png
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  2. 0

    It looks to me like you are trying to trim whitespace, in which case you’d be better using -trim as it will trim correctly regardless of colour (provided it is solid) and regardless of the amount of trimming required:

    magick input.png -trim +repage result.png

    enter image description here

    I have added a red border purely for display purposes so you can see the extent of the cropped image even on Stack Overflow’s white background.

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