Duotone

Applies a two-tone color effect.

Parameters

texture Texture: The input texture to be filtered. Default: undefined
tone1 Vec2: The RGB values of the first tone. Default: (0.0, 0.0, 0.0)
tone2 Vec2: The RGB values of the second tone. Default: (0.0, 0.0, 0.0)

Example

let layer,
  bird,
  duoTone;

function preload() {
    duoTone = createShader(fip.defaultVert, fip.duoTone); // Load the shader
    bird = loadImage("bird.jpg");
}

function setup() {
    createCanvas(600, 600, WEBGL); // Use WEBGL mode to use the shader
    layer = createFramebuffer(); // Create a framebuffer to draw the image onto
}

function draw() {
    background(0);

    // Draw an image to a framebuffer 
    layer.begin();
    clear();
    scale(1, -1); // Flip the Y-axis to match the canvas (different coordinate system in framebuffer)
    image(bird, -width / 2, -height / 2, width, height);
    layer.end();

    // Apply the shader
    shader(duoTone);

    // Set the shader uniforms
    duoTone.setUniform("texture", layer.color); // Set the texture to apply the shader to
    duoTone.setUniform('tone1', [0.8627, 0.6275, 0.0]);
    duoTone.setUniform('tone2', [0.4157, 0.0118, 0.5647]);

    rect(0, 0, width, height); // Draw a rectangle to apply the shader to
    resetShader(); 
}