Get dominant color from an image using ImageSharp and ImageProcessor

DominantColor.cs

// ##### ImageSharp #####

using (var image = Image.Load<Rgb24>(inPath))
{
    image.Mutate(
        x => x
        // Scale the image down preserving the aspect ratio. This will speed up quantization.
        // We use nearest neighbor as it will be the fastest approach.
        .Resize(new ResizeOptions() { Sampler = KnownResamplers.NearestNeighbor, Size = new Size(100, 0) })

        // Reduce the color palette to 1 color without dithering.
        .Quantize(new OctreeQuantizer(null, 1)));

    Rgb24 dominant = image[0, 0];
}

// ##### ImageProcessor #####

using (var factory = new ImageFactory())
{
    // Scale the image down preserving the aspect ratio.
    // This will speed up quantization.
    factory.Load(inPath).Resize(new Size(100, 0));

    // Reduce the color palette to 1 color.
    var octree = new OctreeQuantizer(1, 1);
    using (Bitmap quantized = octree.Quantize(factory.Image))
    {
        // All pixels will share same color
        Color dominent = quantized.GetPixel(0, 0);
    }
}

Glad it’s useful!

This should be .Quantize(new OctreeQuantizer(new QuantizerOptions { MaxColors = 1 }))); for v3. Thanks Jim.