GmagickPixel::getcolorvalue()
(PECL gmagick >= Unknown)
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.