Detect main colors in an image with PHP

Question

I am trying to replicate the functionality that Dribbble.com does with detecting the predominant colors in an Image. In the image below you can see a screenshot from Dribbb

Answer 1

The idea of getting the predominant colors of the image is a bit tricky, because for example the most frequent pixel color could be so widely scattered in the image that it is not perceived as a predominant color at all.

I think an algorithm like Color coherence vector will be good enough to overcome this issue, because it clusters the colors into coherent and incoherent (which is quite intuitive), and then you can use them to discard those false positive predominant colors.

I see it is an easy algorithm to implement, this tutorial Image Retrieval: Color Coherence Vector describes describes its steps with examples of how it works and there is even a matlab implementation mentioned at the end of it.