Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

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.

成功时返回 TRUE。

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