Imagick::evaluateImage
(No version information available, might be only in CVS)
Imagick::evaluateImage — Applies an expression to an image
Description
bool Imagick::evaluateImage
( int $op
, float $constant
[, int $channel
] )
WarningThis function is
currently not documented; only its argument list is available.
Applys an arithmetic, relational, or logical expression to an image. Use
these operators to lighten or darken an image, to increase or decrease
contrast in an image, or to produce the "negative" of an image.
Parameters
-
op
-
The operator
-
constant
-
The value of the operator
-
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.
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
Imagick::equalizeImage
