Color of Image is used to extract a color palette from a given image. Aside from being a native PHP implementation, Color of Image differes from many palette extracters as it works off a white list color palette. Below is the default palette:
The main advanage of working from a color palette is closer matching, as each pixel simply has to calculate the color-distance within the palatte and chose the best match. This is useful for working with color taxonomies as the taxonomy should have a finate amount of colors.
See an example of this in action here: http://www.rufflr.com/search/?color=ffcc33
// initiate with image $image = new ColorsOfImage( 'https://www.google.co.uk/images/srpr/logo3w.png' ); // get the prominent colors $colors = $image->getProminentColors(); // array( '#FFFDD', ... )
And there we go!
ColorsOfImage will process every 10th pixel. This is for performance reasons, you can change this like below. The precision is a performance-to-time desicion.
$image = new ColorsOfImage( $src, 5 /* precision */ );
To control the amount colors returned set the third parameter.
$image = new ColorsOfImage( $src, 5, 3 /* number of colors to return */ );