Drawbot Halftone

This is an evolution of my own basic halftone effect using Drawbot.

Drawbot is a macOS powerful tool for creating graphics and animations. It is a great tool for generative art and graphic design. This script uses Drawbot to create a halftone effect from an image.

Installation

1. Clone this repository.

git clone https://github.com/werls/drawbot-halftone.git

2. Change to the repository directory.

cd drawbot-halftone

3. Install the requirements.

pip install -r requirements.txt

4. Run the script.

python drawbot_halftone.py --path /path/to/image.jpg

Parameters

Parameter	Type	Description	Default
--path	string	The path to the image file.	None
--resolution	int	The resolution of the halftone grid.	100
--contrast	float	The maximum size of the halftone dots.	1
--dot-min-size	float	The minimum size of the halftone dots.	0
--angle	float	The angle of rotation for the halftone grid.	45
--color	string	The color of the halftone dots.	0,0,0,1
--color_mode	string	The color mode of the halftone dots (rgba or cmyk).	rgba
--honeycomb	bool	Use a honeycomb grid instead of a square grid.	True
--reescale_image	bool	Reescale the image to fit the canvas default size.	False
--inverse	bool	Invert the colors of the image.	False
--preset	string	A JSON string or file path of settings for the halftone effect.	None
--verbose	bool	Print the settings of the halftone effect.	True

Presets

You can create a JSON file with the settings for the halftone effect. Here is an example:

{
    "resolution": 100,
    "contrast": 1,
    "angle": 45,
    "color": "0,0,0,1",
    "color_mode": "rgba",
    "honeycomb": true,
    "reescale_image": false,
    "save": true
}

The preset file can be passed as a parameter to the script.

python drawbot_halftone.py --path /path/to/image.jpg --preset /path/to/preset.json

In the /presets/ folder you can find some examples of preset files.

Batch processing with presets

You can use the following command to process multiple images with the same preset.

for file in folder/*; do python main.py --path "$file" --preset=presets/halftone-pc-portraits.json; done