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images: added imagemagick and rotate guide

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# ImageMagick
[ImageMagick](https://imagemagick.org/) is a free and open-source, cross-platform software suite for
displaying, creating and editing (raster) images.
## Usage
The following section addresses different uses ImageMagick.
For most of ImageMagicks features the [command-line interface](/wiki/system_console.md) can be used.
## Rotate an Image
To rotate an image and save the edited copy of the image run the following command.
`origin.png` is the image to be rotated and `target.png` is the rotated image.
`90` is the degrees the image `origin.png` will be turned by.
Change these values as needed.
```sh
convert origin.png -rotate 90 target.png
```

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wiki/images.md
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Editing images can be done by various image manipulation software.
A popular cross-platform program for this is [GIMP](https://www.gimp.org/).
A second cross-platform software suite for displaying, creating and editing (raster) images is
[ImageMagick](/wiki/imagemagick.md).
Another part of image manipulation is the upscaling of low resolution images.
This can be done by the cross-platform program [upscayl](https://github.com/upscayl/upscayl).