Railo 4.2 Reference
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Sharpens a image by using the unsharp mask filter.


imagesharpen(any name,[number gain]):void


The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
name any  Yes The image on which this operation is performed.  
gain number  No Gain values can be integers or real numbers. The default value is 1.0.
The value determines whether the image is blurred or sharpened:
  • if > 0, the image is sharpened
  • if = 0, no effect
  • if < 0, the image is blurred