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# Extract-green-color
Extract green color from a photo of LCD Writing Tablet.
## Requirements
* [GNU Guile](https://www.gnu.org/software/guile/) >= 2.2.7
* [Guile-CV](https://www.gnu.org/software/guile-cv/index.html) >= 0.2.1
## Installation
### Install with Guix
Add `tojo-tokyo` channel to `~/.config/guix/channels.scm`:
(cons* (channel
(name 'tojo-tokyo)
(url "https://git.tojo.tokyo/tojo-tokyo-guix-channel.git")
%default-channels)
And proceed following:
guix pull
guix install extract-green-color
### Install from the tarball
To install from the tarball, proceed the following:
wget https://files.tojo.tokyo/extract-green-color/extract-green-color-1.0.0.tar.gz
tar xvf extract-green-color-1.0.0.tar.gz
cd extract-green-color
./configure
make
make install
## Usage
To extract green color from `input.png` to `output.png`, proceed the following:
extract-green-color.scm input.png output.png
To see more details, run `extract-green-color.scm --help`.
## License
GNU GPLv3+
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