The Imagick class
PHP Manual

Imagick::contrastStretchImage

(PECL imagick 2.0.0)

Imagick::contrastStretchImageEnhances the contrast of a color image

Описание

bool Imagick::contrastStretchImage ( float $black_point , float $white_point [, int $channel= Imagick::CHANNEL_ALL ] )
Предупреждение

Към момента тази функция не е документирана; наличен е единствено списъкът с аргументите й.

Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available

Параметри

black_point

The black point.

white_point

The white point.

channel

Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Defaults to Imagick::CHANNEL_ALL. Refer to this list of channel constants.

Връщани стойности

Връща TRUE при успех.


The Imagick class
PHP Manual