The Imagick class
PHP Manual

Imagick::thresholdImage

(PECL imagick 2.0.0)

Imagick::thresholdImageChanges the value of individual pixels based on a threshold

说明

bool Imagick::thresholdImage ( float $threshold [, int $channel = Imagick::CHANNEL_ALL ] )
Warning

本函数还未编写文档,仅有参数列表。

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

Returns TRUE on success.


The Imagick class
PHP Manual