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 )