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BlackAndWhite

by Mewatools

Converts an image into Black and White using an arithmetic average of the 3 color channels. The output contains the same black and white image in the 4 channels.

Script
// "BlackAndWhite" by Mewatools <hugo@mewatools.com> is licensed under CC BY 4.0 // convert to black & white using average of the 3 color channels // ShaderToy: https://www.shadertoy.com/view/fdSXzz shaderSource = " void mainImage( out vec4 fragColor, in vec2 fragCoord ) { //const float uBrightness = 0.4; // histogram center, brightens/darkens the image. default = 0.5 //const float uSharpness = 0.5; // between 0.001 and 1. default = 0.5 float dev = uSharpness/2.0; float a = uBrightness - dev; float b = uBrightness + dev; vec4 pixel = texture2D(iChannel0, fragCoord); float gray = (pixel.r + pixel.g + pixel.b) / 3.0; fragColor= vec4( smoothstep(a, b, gray) ); }"; node = ShaderNode( shaderSource, "Black&White" ); node.addShaderInput("iChannel0"); node.setHelpPage("https://www.shadertoy.com/view/fdSXzz"); uiControl = node.addFloatControl("uBrightness", 0.5); uiControl.setName("Brightness"); uiControl.setStep(0.001); uiControl.setRange(0.0, 1.0); uiControl = node.addFloatControl("uSharpness", 0.5); uiControl.setName("Sharpness"); uiControl.setStep(0.001); uiControl.setRange(0.001, 1.0); node.finishAdding();
File Details
  • File Name: BlackAndWhite.mw
  • Last Update: April 27th, 2021
  • Category: Filter
CC BY