ImagickPixel::setColorValue

(PECL imagick 2, PECL imagick 3)

ImagickPixel::setColorValue — Sets the normalized value of one of the channels

说明

public ImagickPixel::setColorValue ( int $color , float $value ) : bool

Sets the value of the specified channel of this object to the provided value, which should be between 0 and 1. This function can be used to provide an opacity channel to an ImagickPixel object.

参数

color: One of the Imagick color constants e.g. \Imagick::COLOR_GREEN or \Imagick::COLOR_ALPHA.
value: The value to set this channel to, ranging from 0 to 1.

返回值

成功时返回 true。

范例

Example #1 Basic Imagick::setColorValue() usage


<?php

$color  = new \ImagickPixel('firebrick');

$color->setColorValue(Imagick::COLOR_ALPHA, 0.5);

print_r($color->getcolor(true));
?>

以上例程会输出：

Array
(
    [r] => 0.69803921568627
    [g] => 0.13333333333333
    [b] => 0.13333333333333
    [a] => 0.50000762951095
)

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