(PECL imagick 2.0.0)
Imagick::contrastStretchImage — Enhances the contrast of a color image
$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. 이 메쏘드는 Imagick을 ImageMagick 6.2.9 이상으로 컴파일 했을 때만 사용할 수 있습니다.
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.
성공시에 TRUE
를 반환합니다.