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Generate CMYK halftone images

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# halftone

A python module that uses creates CMYK images and halftone representations

Heavily adapted from [this StackOverflow answer][so] by [fraxel][fr] and [this code][gh] by [Phil Gyford][pg]

[pil]: http://www.pythonware.com/products/pil/
[so]: http://stackoverflow.com/questions/10572274/halftone-images-in-python/10575940#10575940
[fr]: http://stackoverflow.com/users/1175101/fraxel
[gh]: https://github.com/philgyford/python-halftone
[pg]: https://github.com/philgyford

## Usage

halftone.py [-h] [-a ANGLES [ANGLES ...]] [-b {1,2,4,6,8}] [-c] [-d]
                   [-e EXTRA_FILE_NAME] [-f FILL] [-g GRAY] [-p SHARPNESS]
                   [-s SIZE]
                   file

Creates four CMYK images and a combined image.  Provides options for haltoning or not (-d)

| OPTION 				 | DESCRIPTION                                     | Default | 
| ---------------------- | ----------------------------------------------- | ------- | 
| -h, --help             | show this help message and exit                 | n/a     | 
| -b, --bits {1,2,4,6,8} | bits of color info per channel                  | 8       | 
| -c, --colorize_CMYK    | save CMYK files as RGB color images             | False   | 
| -d, --do_not_halftone	 | don't do halftoning                             | False   | 
| -e, --extra_file_name  | final name addition for each channel            | "_Clr"  | 
| -f, --fill  			 | dot fill (size) value                           | 0.5     | 
| -g, --gray  			 | percent of gray component replacement (K level) | 100     | 
| -p, --sharpness  		 | level of sharpness of the dots                  | 1.0     | 
| -s, --size  			 | half size of averaging region (pixels)          | 3       |

## Examples

|               | Haltoned                           | CMYK Only                            | 
| ------------- | :--------------------------------: | :----------------------------------: | 
| Original      | ![Original Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB.png)  | ![Original Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/Banff.jpg)  | 
| C-Channel     | ![C Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB_Clr0.png)    | ![C Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/banff_Clr0.png)    |
| M-Channel     | ![M Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB_Clr1.png)    | ![M Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/banff_Clr1.png)    |
| Y-Channel     | ![Y Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB_Clr2.png)    | ![Y Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/banff_Clr2.png)    |
| K-Channel     | ![K Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB_Clr3.png)    | ![K Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/banff_Clr3.png)    |
| Combined CMYK | ![CMYK Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/RGB_CMYK.png) | ![CMYK Image](https://raw.githubusercontent.com/ClayFlannigan/halftone/master/pics/banff_CMYK.png) |

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