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.