OverlayBlend
by Mewatools
Blends 2 images using the overlay blend method.
Script
// "OverlayBlend" by Mewatools <hugo@mewatools.com> is licensed under CC BY 4.0
// https://en.wikipedia.org/wiki/Blend_modes#Overlay
// Brief: Blends 2 images using overlay blend method
shaderSource = "
vec3 blend(vec3 a, vec3 b) {
float light = (a.x + a.y + a.z) / 3.0;
if( light < threshold ){
return 2. * a * b;
}
return 1. - 2.*(1.-a)*(1. - b);
}
void mainImage( out vec4 fragColor, in vec2 fragCoordA, in vec2 fragCoordB ){
vec3 a = texture2D(iChannel0, fragCoordA).rgb;
vec3 b = texture2D(iChannel1, fragCoordB).rgb;
fragColor = vec4( blend(a,b), 1.0 );
}";
node = ShaderNode( shaderSource, "OverlayBlend" );
node.addShaderInput( "iChannel0" );
node.addShaderInput( "iChannel1" );
uiControl = node.addFloatControl("threshold", 0.5);
uiControl.setName("Threshold");
uiControl.setStep(0.0001);
uiControl.setRange(0.0, 1.0);
node.finishAdding();
File Details
- File Name: OverlayBlend.mw
- Last Update: November 29th, 2020
- Category: Merge
