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  ImageMagick Tutorial: How to cut images in Linux command line
  Add Date : 2017-08-31      
  Question: I want to remove the image files white blank, there is no convenient way to image files can be tailored at the Linux command line?

When it comes to conversion in Linux or edit the image file, ImageMagick is undoubtedly one of the most well-known integration software. It contains a set of command-line tool to display, convert, or copy in more than 200 types of raster or vector image files, all of which is done at the command line. ImageMagick can be used for a variety of image editing tasks such as converting file formats, add special effects, add text, and change the image (resize, rotate, flip, crop).

If you wish to crop the image to remove the blank, you can use ImageMagick comes with two command-line tools. If you have not installed ImageMagick, please refer to the following useful links to install.

In this tutorial, let's cut the following PNG image. We want to remove the right and bottom edges of the image, so that the icon is centered.

First, the size of the identified image file (width and height). You can use the identity command.

$ Identify chart.png
chart.png PNG 1500x10001500x1000 + 0 + 08-bit DirectClass31.7KB0.000u0: 00.000
As illustrated above, the input image is 1500x1000px.

Next, determine the image trimming to do two things: (2) the size of the rectangular clipping region (1) Location trimming image began.

In this example, let us assume that the image cropped from the top left, with a more precise point at x = 20px and y = 10px, in that case, the image size is trimmed 1200x700px.

Tools for cropping an image is convert. Use "-crop" option is selected, convert the command will be cut out a rectangular area in the input image.

$ Convert chart.png -crop 1200x700 + 20 + 10 chart-cropped.png
Specify the input image to image storage chart.png, convert the command will be trimmed to chart-cropped.png.
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