ImagickPixel::setColorValue()

(PECL imagick 2.0.0)

Sets the normalized value of one of the channels

说明

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
)