Imagick::thresholdImage

(PECL imagick 2.0.0)

Imagick::thresholdImage — Changes the value of individual pixels based on a threshold

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

Warning

本函数暂无文档，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.

Returns TRUE on success.