Py5Graphics.alpha()

Extracts the alpha value from a color, scaled to match current Py5Graphics.color_mode().

Description

Extracts the alpha value from a color, scaled to match current Py5Graphics.color_mode().

The alpha() function is easy to use and understand, but it is slower than a technique called bit shifting. When working in color_mode(RGB, 255), you can achieve the same results as alpha() but with greater speed by using the right shift operator (>>) with a bit mask. For example, alpha(c) and c >> 24 & 0xFF both extract the alpha value from a color variable c but the later is faster.

This method has additional color functionality that is not reflected in the method’s signatures. For example, you can pass the name of a color (e.g. “green”, “mediumpurple”, etc). Look at the online “All About Colors” Python Ecosystem Integration tutorial for more information.

This method is the same as alpha() but linked to a Py5Graphics object. To see example code for how it can be used, see alpha().

Underlying Processing method: PGraphics.alpha

Signatures

alpha(
    rgb: int,  # any value of the color datatype
    /,
) -> float

Updated on December 25, 2023 16:36:33pm UTC