This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.
color c = color(255, 204, 0); // Define color 'c' fill(c); // Use color variable 'c' as fill color rect(15, 20, 35, 60); // 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(50, 20, 35, 60); // Draw right rectangle
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 acheive 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
>> (right shift)