Imagick::unsharpMaskImage
(No version information available, might be only in CVS)
Imagick::unsharpMaskImage — Sharpens an image
Description
bool Imagick::unsharpMaskImage
( float $radius
, float $sigma
, float $amount
, float $threshold
[, int $channel
] )
Warning
此函數目前沒有參考文件；只有引數列表。
Warning
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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.