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  1. Black and White+ version 1.1 Black and White+ includes 3 different algorithms to convert a color image into a black-and-white image. Luminosity Method Shade of Gray = 0.299 * Red + 0.587 * Green + 0.114 * Blue This is the default method. This is how the built-in Black-and-White effect converts a color image to black-and-white. This method gives different weights to Red, Green, and Blue. Other methods treat each color equally. Average Method Shade of Gray = (Red + Green + Blue) / 3 Lightness Method Shade of Gray = [Max(Red,Green,Blue) + Min(Red,Green,Blue)] / 2 Every color photograph is different. You'll just need to try each method to see which one works best for your specific photograph. Brightness/Contrast In addition to converting your photograph to black-and-white, I've also provided access to the Brightness and Contrast adjustments. For a more dramatic effect, decrease the brightness (try -10) and increase the contrast (try +10). Download Download this effect as part of my plugin pack: https://forums.getpaint.net/topic/113220-b Source Code Here is the icon: and here is the CodeLab source: // Name: Black and White+ // Author: BoltBait // Submenu: Adjustments // Title: BoltBait's Black and White+ v1.1 // Version: 1.1 // Desc: Convert image to Black and White // Keywords: Black and White|B&W // URL: http://BoltBait.com/pdn #region UICode ListBoxControl Amount1 = 0; // |Luminosity Method|Average Method|Lightness Method IntSliderControl Amount2 = 0; // [-100,100] Brightness/Contrast IntSliderControl Amount3 = 0; // [-100,100] #endregion BrightnessAndContrastAdjustment bacAdjustment = new BrightnessAndContrastAdjustment(); PropertyCollection bacProps; private double Max3(double x, double y, double z) { return (x > y) ? ((x > z) ? x : z) : ((y > z) ? y : z); } private double Min3(double x, double y, double z) { return (x < y) ? ((x < z) ? x : z) : ((y < z) ? y : z); } protected override void OnDispose(bool disposing) { if (disposing) { if (bacAdjustment != null) bacAdjustment.Dispose(); bacAdjustment = null; } base.OnDispose(disposing); } void PreRender(Surface dst, Surface src) { bacProps = bacAdjustment.CreatePropertyCollection(); PropertyBasedEffectConfigToken bacParameters = new PropertyBasedEffectConfigToken(bacProps); bacParameters.SetPropertyValue(BrightnessAndContrastAdjustment.PropertyNames.Brightness, Amount2); bacParameters.SetPropertyValue(BrightnessAndContrastAdjustment.PropertyNames.Contrast, Amount3); bacAdjustment.SetRenderInfo(bacParameters, new RenderArgs(dst), new RenderArgs(src)); } unsafe void Render(Surface dst, Surface src, Rectangle rect) { // Call the Brightness and Contrast Adjustment function bacAdjustment.Render(new Rectangle[1] {rect},0,1); for (int y = rect.Top; y < rect.Bottom; y++) { if (IsCancelRequested) return; ColorBgra* dstPtr = dst.GetPointAddressUnchecked(rect.Left, y); for (int x = rect.Left; x < rect.Right; x++) { ColorBgra CurrentPixel = *dstPtr; byte K = CurrentPixel.R; if (!(CurrentPixel.R == CurrentPixel.G && CurrentPixel.G == CurrentPixel.B)) { switch (Amount1) { case 0: K = (byte)((0.299f * CurrentPixel.R) + (0.587f * CurrentPixel.G) + (0.114f * CurrentPixel.B)); break; case 1: K = (byte)((CurrentPixel.R + CurrentPixel.G + CurrentPixel.B) / 3.0); break; case 2: K = (byte)((Max3(CurrentPixel.R, CurrentPixel.G, CurrentPixel.B) + Min3(CurrentPixel.R, CurrentPixel.G, CurrentPixel.B)) / 2.0); break; default: break; } } CurrentPixel = ColorBgra.FromBgra(K,K,K,CurrentPixel.A); *dstPtr = CurrentPixel; dstPtr++; } } } Note: User MJW also made a Black and White+ plugin. His has way more adjustments than mine. I'm not sure, but you might be able to use his to get the same results as mine... I just couldn't figure out how to do it. If you like LOTS of things to tinker with, you might give his a try. The above is for Paint.NET v4.1.4+ Paint.NET v3.5.11 I'm sure someone will come along shortly and compile this for you.