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//small test: just a really small image to debug and check pixel values

 using (MagickImage spotImage = new MagickImage(@"C:\test\small-test.TIF"))
            {                
                spotImage.ColorSpace = ColorSpace.CMYK;
                using (PixelCollection pc = spotImage.GetPixels())
                {
                    foreach (Pixel p in pc)
                    {
                        int chan1 = p.GetChannel(0);
                        int chan2 = p.GetChannel(1);
                        int chan3 = p.GetChannel(2);
                        int chan4 = p.GetChannel(3);

                        if (chan1 == chan2 && chan2 == chan3 && chan3 == chan4 && chan1 == 0)
                        {
                            p.SetChannel(0, 0);
                            p.SetChannel(1, 100);
                            p.SetChannel(2, 100);
                            p.SetChannel(3, 0);
                            pc.Set(p);
                        }
                    }
                    spotImage.Write(@"C:\test\test.png");
                }