New Post: Quantization & Unique (Dominant) Colors

I'm trying to reduce the colors of an image to 8 dominant colors, and I have a picture of a rainbow here:



I've got code like this:

var qSettings = new QuantizeSettings { Colors = 8, DitherMethod = DitherMethod.No, ColorSpace = ImageMagick.ColorSpace.RGB};
imageMagick.Quantize(qSettings);
                
imageMagick.Write("c:\\work\\test.png");

No matter what combination I try (changing the ColorSpace, modifying TreeDepth, etc.), it will always merge at least two of the bars together. usually red and orange or dark blue and violet.

I was using MagickNet 6.8.9.601, but I just switched to 7.0.0.0001 to see if that would help anything. It didn't. Why does Quantize do that? Do you have any advice or suggestions?