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Replace image with a sharpened version of the original image using the unsharp mask algorithm.
Component | Version | macOS | Windows | Linux | Server | iOS SDK |
GraphicsMagick | 2.0 | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
Parameter | Description | Example |
---|---|---|
ImageRef | The image reference number. | 1 |
ChannelType | ChannelType | One of the following values: RedChannel = 1 (RGB Red channel), CyanChannel = 2 (CMYK Cyan channel), GreenChannel = 3 (RGB Green channel), MagentaChannel = 4 (CMYK Magenta channel), BlueChannel = 5 (RGB Blue channel), YellowChannel = 6 (CMYK Yellow channel), OpacityChannel = 7 (Opacity channel), BlackChannel = 8 (CMYK Black (K) channel), MatteChannel = 9 (Same as Opacity channel (deprecated)), AllChannels = 10 (Color channels), GrayChannel = 11 (Color channels represent an intensity.) |
radius | the radius of the Gaussian, in pixels, not counting the center pixel. | 0 |
sigma | the standard deviation of the Gaussian, in pixels. | 1 |
amount | the percentage of the difference between the original and the blur image that is added back into the original. 50 | 1 |
threshold | the threshold in pixels needed to apply the diffence amount. | 0.05 |
Returns "OK" on success.
This function checks for a license.
Created 18th August 2014, last changed 27th September 2022