The Imagick class
PHP Manual

Imagick::randomThresholdImage

(PECL imagick 2.0.0)

Imagick::randomThresholdImageCreates a high-contrast, two-color image

说明

bool Imagick::randomThresholdImage ( float $low , float $high [, 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. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.

参数

low

The low point

high

The high point

channel

Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

返回值

Returns TRUE on success.


The Imagick class
PHP Manual