Question

How to convert RGB to CMYK in C#

Answer 1

using System;

// CMYK = Cyan, Magenta, Yellow, Key(black)
// RGB = Red, Green, Blue

public class MyClass
{
	private static double[] RGBtoCMYK(double R, double G, double B) {
		if (R == 0 && G == 0 && B == 0) {
			return new double[]{0, 0, 0, 1};
		}

		R = R / 255.0 * 100;
		G = G / 255.0 * 100;
		B = B / 255.0 * 100;

		double K = 100 - Math.Max(Math.Max((int)R, (int)G), (int)B);

		if (K == 100) {
			return new double[]{0, 0, 0, 100};
		}

		double C = Math.Round((100 - R - K) / (100 - K) * 100, MidpointRounding.AwayFromZero);
		double M = Math.Round((100 - G - K) / (100 - K) * 100, MidpointRounding.AwayFromZero);
		double Y = Math.Round((100 - B - K) / (100 - K) * 100, MidpointRounding.AwayFromZero);

		return new double[]{C, M, Y, K};
	}
	public static void Main(string[] args)
	{
		double[] CMYK = RGBtoCMYK(245.0f, 213.0f, 0.0f);

		Console.WriteLine(string.Join(" ", CMYK));
	}
}




/*
run:
 
0 13 100 4
 
*/

 

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