Name
red()
Description
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
Examples
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
Syntax
red(rgb)
Parameters
rgb(int)any value of the color datatype
Return
float
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