alpha()颜色的透明度值

Name

alpha()颜色的透明度值

Examples

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.

从颜色中提取 alpha 值。

Syntax

alpha(rgb)

Parameters

Returns

float

Related

red()
green()
blue()
hue()
saturation()
brightness()