Imagick::textureImage
getQuantumRange() can be handy here:
<?php
$i = new Imagick($imageFile);
$max = $i->getQuantumRange();
$max = $max["quantumRangeLong"];
$i->thresholdImage(0.77 * $max);
?>
Imagick::thresholdImage
(PECL imagick 2.0.0)
Imagick::thresholdImage — Changes the value of individual pixels based on a threshold
说明
bool Imagick::thresholdImage
( float
$threshold
[, int $channel = Imagick::CHANNEL_ALL
] )Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
参数
-
threshold -
-
channel -
返回值
成功时返回 TRUE。
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User Contributed Notes
Imagick::thresholdImage - [1 notes]
php t traction dot de ¶
10 months ago