GmagickPixel::getcolorvalue
(PECL gmagick >= Unknown)
GmagickPixel::getcolorvalue — Gets the normalized value of the provided color channel
说明
public GmagickPixel::getcolorvalue(int$color): float
Retrieves the value of the color channel specified, as a floating-point number between 0 and 1.
参数
color
The channel to check, specified as one of the Gmagick channel constants.
返回值
The value of the channel, as a normalized floating-point number, throwing GmagickPixelException on error.
User Contributed Notes
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