Imagick::contrastStretchImage
Enhances the contrast of a color image
Description
public bool Imagick::contrastStretchImage(float $black_point
, float $white_point
, int $channel
= Imagick::CHANNEL_DEFAULT)
Parameters
-
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.
Return Values
Returns true
on success.