red()

Extracts the red value from a color, scaled to match current colorMode(). The value is always returned as a float, so be careful not to assign it to an int value.

The red() function is easy to use and understand, but it is slower than a technique called bit shifting. When working in colorMode(RGB, 255), you can achieve the same results as red() but with greater speed by using the right shift operator (>>) with a bit mask. For example, the following two lines of code are equivalent means of getting the red value of the color value c:

 float r1 = red(c); // Simpler, but slower to calculate
 float r2 = c >> 16 & 0xFF; // Very fast to calculate 

• size(400, 400);
  
  color c = color(255, 204, 0); // Define color 'c'
  fill(c); // Use color variable 'c' as fill color
  rect(60, 80, 140, 240); // Draw left rectangle
   
  float redValue = red(c); // Get red in 'c'
  println(redValue); // Print "255.0"
  fill(redValue, 0, 0); // Use 'redValue' in new fill
  rect(200, 80, 140, 240); // Draw right rectangle

  👁 Image
  

• red(rgb)

• rgb(int)any value of the color datatype

• float

• green()
• blue()
• alpha()
• hue()
• saturation()
• brightness()
• rightshift()