colorific 0.3

Automatic color palette detection

Image palette detection in Python modelled after Paul Annesley’s color detector in PHP. colorific determines what the most important colors used in your image are, and if one of them is a background color.

by Dennis Hotson & Lars Yencken

Installation

The easiest way to install colorific is with Python’s pip and virtualenv:

$ virtualenv colorific-sandbox
$ ./colorific-sandbox/bin/pip install colorific

You can then run colorific from ./colorific-sandbox/bin/colorific.

Usage

colorific is meant to run in a streaming manner. You can run it on a single image by echo’ing in the image:

$ echo myimage.png | colorific
myimage.png #3e453f,#2ea3b7,#bee6ea,#51544c,#373d38 #ffffff

Each input line should be a filename. Each output line will be a tab-delimited string containing the filename, major colors in order, and (optionally) a detected background color.

To run on an entire directory tree of images:

$ find . -name '*.jpg' | colorific

For a small amount of images, colorific can also be invoked with the image file names provided as arguments:

$ colorific myimage.png
myimage.png #3e453f,#2ea3b7,#bee6ea,#51544c,#373d38 #ffffff

You can also get a rendered palette with hex codes for each image with the -o argument:

$ colorific -o myimage.png
myimage.png #3e453f,#2ea3b7,#bee6ea,#51544c,#373d38 #ffffff
$ ls
myimage.png  myimage_palette.png

You can use an experimental multiprocessing mode with the -n argument. For example, to run the same example using 8 processes:

$ find . -name '*.jpg' | colorific -p 8

You can also get usage information by running colorific --help.

Example

Here’s a concrete example of use. This is the NASA Ares logo:

Let’s run palette detection on it:

$ echo 500px-NASA-Ares-logo.svg.png | colorific
500px-NASA-Ares-logo.svg.png  #0065b9,#bbd6ec,#ff0000

These correspond to the colors:

Note that black and white have been stripped away, and minor colors introduced through antialiasing are not present.

Changelog

0.3.0

• Python 3 support

• Bump colormath version to 2.0.2

0.2.2

• Use the recent 1.7.8 Pillow release instead of the master branch

• Pin the colormath to 1.0.9 or earlier, given API changes in newer code

0.2.1

• Project renamed to colorific

• Tuning around quantization and color merging

• Use patched Pillow dependency to avoid segmentation fault bug

• Support for outputting a palette file per image

0.2.0

• Tuning around background color, similarity thresholds for merging, and minimum saturation

• Make an importable module

0.1.0

• Functional palette detection