Name
blue()
Description
Extracts the blue 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 blue() function is easy to use and understand, but it is slower
than a technique called bit masking. When working in colorMode(RGB,
255), you can achieve the same results as blue() but with greater
speed by using a bit mask to remove the other color components. For example,
the following two lines of code are equivalent means of getting the blue
value of the color value c:
float b1 = blue(c); // Simpler, but slower to calculate float b2 = c & 0xFF; // Very fast to calculate
Examples
size(400,400); color c = color(175, 100, 220); // Define color 'c' fill(c); // Use color variable 'c' as fill color rect(60, 80, 140, 240); // Draw left rectangle float blueValue = blue(c); // Get blue in 'c' println(blueValue); // Prints "220.0" fill(0, 0, blueValue); // Use 'blueValue' in new fill rect(200, 80, 140, 240); // Draw right rectangle
Syntax
blue(rgb)
Parameters
rgb(int)any value of the color datatype
Return
float
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