Imagick::unsharpMaskImage
(PECL imagick 2.0.0)
Imagick::unsharpMaskImage — Sharpens an image
Description
bool Imagick::unsharpMaskImage
( float $radius
, float $sigma
, float $amount
, float $threshold
[, int $channel = Imagick::CHANNEL_ALL
] )
Warning
This function is currently not documented; only its argument list is available.
Sharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and Imagick::UnsharpMaskImage() selects a suitable radius for you.
Parameters
- radius
-
- sigma
-
- amount
-
- threshold
-
- channel
-
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.