p5.js | red() function

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.

filter_none

edit
close

play_arrow

link
brightness_4
code

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);
}

chevron_right


Output:

Example 2: This example uses red() function to extract the red value from the pixel array and used as fill color.

filter_none

edit
close

play_arrow

link
brightness_4
code

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);
}

chevron_right


Output:

Reference: https://p5js.org/reference/#/p5/red



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.