The red() function in p5.js is used to extract the red value from a color or pixel array.
Syntax:
red(c)
Parameters: This function accepts single parameter c which stores the p5.Color object, color components, or CSS color.
Below programs illustrates the red() function in p5.js:
Example 1: This example uses red() function to extract the red value from the pixel array.
function setup() {       // Create Canvas of size 300*80     createCanvas(300, 80); }   function draw() {           // Set background color     background(220);           // Initialize the parameter     let c = color(67, 126, 255, 102);           // Extract the red value     let y = red(c);           // Set the font size     textSize(16);       // Set the font color     fill(color('red'));           // Display result     text("Red Value is : " + y, 50, 30); } |
Output:
Example 2: This example uses red() function to extract the red value from the pixel array and used as fill color.
function setup() {       // Create Canvas of size 300*180     createCanvas(160, 180); }   function draw() {           // Set background color     background(220);           // Initialize the parameter     let c = color(80, 126, 100, 34);           // Sets 'value' to 80     let value = red(c);           // Fill the color     fill(value, 0, 0);           // Create rectangle     rect(50, 15, 35, 70);           // Display result     text("Value of red is : " + value, 22, 110); } |
Output:
Reference: https://p5js.org/reference/#/p5/red
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