The Imagick class
PHP Manual

Imagick::linearStretchImage

(PECL imagick 2.0.0)

Imagick::linearStretchImage — Stretches with saturation the image intensity

说明

bool Imagick::linearStretchImage ( float $blackPoint , float $whitePoint )

Stretches with saturation the image intensity.

参数

blackPoint

The image black point

whitePoint

The image white point

返回值

Returns TRUE on success.

The Imagick class
PHP Manual