Imagick
PHP Manual

Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImageForce all pixels above the threshold into white

说明

bool Imagick::whiteThresholdImage ( mixed $threshold )

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

参数

threshold

返回值

成功时返回 TRUE

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.


Imagick
PHP Manual