Enhances the contrast of a color image


(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 ] )

Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available. Этот метод доступен, если Imagick был скомпилирован с версией ImageMagick 6.2.9 или старше.

Список параметров

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. Imagick::CHANNEL_ALL. Refer to this list of channel constants.

Возвращаемые значения

В случае успешной работы возвращает TRUE.