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inkscape: added inkscape and handwriting convert guide

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# Images
An image is a visual representation of something.
In the computer context it is a file with an extension like `png`, `jpg`, `gif` among others.
In the computer context it is a file with an extension like `png`, `jpg`, `gif` and `svg` for
vector graphics but there are many more.
This entry also features medicinal image and visual formats such as DICOM.
## Clients
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- [sxiv](https://github.com/xyb3rt/sxiv) is an image viewer for [Linux'](/wiki/linux.md)
[X window system](/wiki/linux/x_window_system.md).
- [Weasis](https://github.com/nroduit/Weasis) is a cross-platform DICOM viewer.
- [Inkscape](/wiki/inkscape.md) is a cross-platform vector graphic editor.
## Editing

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# Inkscape
[Inkscape](https://inkscape.org/) is a cross-platform editor for vector graphics.
## Setup
On the [Inkscape website](https://inkscape.org/release/) setup files for
[Windows](/wiki/windows.md), MacOS and [Linux](/wiki/linux.md) can be found.
On most Linux distributions Inkscape can usually be installed with the corresponding
[package manager](/wiki/linux/package_manager.md).
## Usage
This section addresses various way to use Inkscape for specific tasks.
### Convert Handwriting to Vector Graphic
To convert handwriting to a vector graphic an image of the writing should first be opened in
Inkscape.
First the levels of black and white can be changed by using `Extensions > Raster > Levels` and
changing the values for white and black points.
Afterwards the bitmap should be traced.
For this select `Path > Trace Bitmap` and change the values in the Detection mode
`Brightness cutoff` until it matches your expectations.
After this the image has been converted to a bitmap, but most of the times it is not smooth and has
quite some errors.
The removal can be done by hand by removing the points manually.
This is useful to do for bigger errors.
For smaller errors `Path > Simplify` can be used.