Gets the alpha (transparency) value of a color.
alpha() extracts the alpha value from a p5.Color object, an array of color components, or a CSS color string.
In p5.strands shader callbacks, alpha() operates on vec4 values and returns the alpha channel as a normalized value in the 0–1 range. colorMode() has no effect inside shader callbacks.
Examples
Syntax
alpha(color)
Parameters
color
p5.Color|Number[]|String: p5.Color object, array of color components, or CSS color string.
Returns
Number: the alpha value.
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