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(PECL imagick 2.0.0)
ImagickPixel::setColorValue — Sets the normalized value of one of the channels
$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.
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.
成功时返回 TRUE 。
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
)