ImagickPixel::setColorValue

(PECL imagick 2.0.0)

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

说明

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

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
)