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.

Name

alpha()

Examples
example pic
noStroke();
color c = color(0, 126, 255, 102);
fill(c);
rect(15, 15, 35, 70);
float value = alpha(c);  // Sets 'value' to 102
fill(value);
rect(50, 15, 35, 70);
Description Extracts the alpha value from a color.
Syntax
alpha(rgb)
Parameters
rgb int: any value of the color datatype
Returnsfloat
Relatedred()
green()
blue()
hue()
saturation()
brightness()
Updated on October 2, 2018 05:02:10pm EDT

Creative Commons License