colors_from_image
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Fudge
Rails Plugin which finds interesting CSS colors in an image, which can be used to suggest custom theme colors based on an uploaded image.
ColorsFromImage
Find colors from an example image, which can be used to provide theme colors matching an uploaded logo.
Inspired by http://blog.dabbledb.com/2007/04/white--or-green.html
It uses RMagick / ImageMagick to find interesting colors from an image based on saturation, luminance, and the histogram.
Installation
Rails 2.1:
./script/plugin install git://github.com/Fudge/colors_from_image.git
Rails 2.0.2:
cd vendor/plugins; git clone git://github.com/Fudge/colors_from_image.git
Example
ColorsFromImage.get_colors('/path/to/logo.jpg') # => ["#020202", "#fb680d", "#dc8e53", "#9f643f"]
background, primary, secondary, tertiary = ColorsFromImage.get_colors('/path/to/logo.jpg') text_color = ColorsFromImage.dark?(background) ? "#fff" : "#333"
The first result is the background color (nil if the image is transparent), and the following entries are the interesting colors sorted by relevance.
Copyright (c) 2008 Erlend Simonsen, released under the MIT license
Fudge