The Imagick class
PHP Manual

Imagick::blackThresholdImage

(PECL imagick 2.0.0)

Imagick::blackThresholdImageForces all pixels below the threshold into black

说明

bool Imagick::blackThresholdImage ( mixed $threshold )
Warning

本函数还未编写文档,仅有参数列表。

Is like Imagick::thresholdImage() but forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.

参数

threshold

The threshold below which everything turns black

返回值

Returns TRUE on success.

更新日志

版本 说明
2.1.0 Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.


The Imagick class
PHP Manual