Imagick::contrastImageImagick::contrastStretchImage
(PECL imagick 2.0.0)
Imagick::contrastStretchImage — Enhances the contrast of a color image
Opis
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. Ta metoda jest dostępna, jeśli rozszerzenie Imagick zostało skompilowane z ImageMagick w wersji 6.2.9 lub nowszej.
Parametry
- 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.
Zwracane wartości
Zwraca TRUE w przypadku sukcesu.
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