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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. Editing images can be done by various image manipulation software.
A popular cross-platform program for this is [GIMP](https://www.gimp.org/). 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. 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). This can be done by the cross-platform program [upscayl](https://github.com/upscayl/upscayl).