ColorFinder 1.1.0 

dotnet add package ColorFinder --version 1.1.0                

                    
                

            
NuGet\Install-Package ColorFinder -Version 1.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="ColorFinder" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add ColorFinder --version 1.1.0                

                    
                

            
#r "nuget: ColorFinder, 1.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install ColorFinder as a Cake Addin
#addin nuget:?package=ColorFinder&version=1.1.0

// Install ColorFinder as a Cake Tool
#tool nuget:?package=ColorFinder&version=1.1.0

It just gets to all the pixels in the image and store their color value as a key in a hash map. The value is then the number of pixels of the same color encountered. However, this gives poor results so here are the improvements I wrote:
I treat at most 5000 pixels so if the image is bigger I start undersampling. This is an order of magnitude, not a certain rule.
To avoid noise due to flat areas (text, borders, ...) I start by right shifting all the RGB values by 6. So all the values are now between 0 and 3, allowing to encompass large areas of almost-the-same color. Then I perform another pass of the same algorithm (with a shift of 4) on all the pixels falling in the previous winning color group. And so on until I reach zero.
When trying to find the group that has the most pixels, I use a callback to weight the score. This allows customization and tell the algorithm you wand a rather dark color, you wan to exclude black, you want only highly saturated color excluding the greys or anything else you might think of.

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Version Downloads Last updated
1.1.0 3,045 6/5/2015