The Imagick class
PHP Manual

Imagick::linearStretchImage

(PECL imagick 2.0.0)

Imagick::linearStretchImage — Stretches with saturation the image intensity

Description

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

This function is currently not documented; only its argument list is available.

Stretches with saturation the image intensity.

Parameters

blackPoint

The image black point

whitePoint

The image white point

Return Values

Returns TRUE on success.

The Imagick class
PHP Manual