AlbumColors.js - A JavaScript Library To Create A Three Color Palette From An Image

AlbumColors.js is a JavaScript library to pick 3 colors from an image to create a palette for background and text colors, inspired by iTunes 11.

The Algorithm

The algorithm is simple:

• 1. Load image from URL into canvas and get the color array by pixels (AlbumImage)
• 2 Find n (default 10) major colors from the pixel array (AlbumColors)
• 2.1. Diide color spectrum into 64 buckets
• 2.2. Add each color into one of the bucket with a simple approximation
• 2.3. Take the 10 buckets with the largest number of colors in them
• 2.4. Averaging the colors in the dominating buckets to get the presenting color for the buckets
• 3. Among the 10 major colors, pick out 3 (colorChooser)
• 3.1. Color distance is simply defined as the Euclidean distance
• 3.2. The most dominating color (ColorA) will be the background
• 3.3. The color that is most distanced from ColorA, ColorB, will be text color 1
• 3.4. The color that is second distanced form ColorA, ColorC, will be text color 2

Requirements: None
Demo: http://albumcolors…lastfm/?lastfm=willowm
License: NCSA License

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