(PECL imagick 2.0.0)
Imagick::modulateImage — Control the brightness, saturation, and hue
$brightness
, float $saturation
, float $hue
)Lets you control the brightness, saturation, and hue of an image. Hue is the percentage of absolute rotation from the current position. For example 50 results in a counter-clockwise rotation of 90 degrees, 150 results in a clockwise rotation of 90 degrees, with 0 and 200 both resulting in a rotation of 180 degrees.
brightness
saturation
hue
成功时返回 TRUE。
Anonymous (2008-11-30 15:36:10)
Here's a example of this function:
<?php
$img = new Imagick();
$img->readImage($image_file_name);
// leave hue at 100%, drop saturation by 100%, leave brightness at 100%
$img->modulateImage(100, 0, 100);
$img->writeImage($thumb_file_name);
$img->clear();
$img->destroy();
?>