GMImage.UnsharpmaskChannel
--------------------------

Replace image with a sharpened version of the original image using the unsharp mask algorithm.

| Component | Version | macOS | Windows | Linux | Server | iOS SDK |
|---|---|---|---|---|---|---|
| [GraphicsMagick](component_GraphicsMagick.md) | [2.0](newinversion20.md) | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |

MBS( "GMImage.UnsharpmaskChannel"; ImageRef; ChannelType; Radius; sigma; amount; threshold ) 

**MBS**( **"GMImage.UnsharpmaskChannel";** /\* Replace image with a sharpened version of the original image using the unsharp mask algorithm. \*/  
**$ImageRef**; /\* The image reference number.e.g. 1 \*/   
**$ChannelType**; /\* ChannelTypee.g. 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.) \*/   
**$Radius**; /\* the radius of the Gaussian, in pixels, not counting the center pixel.e.g. 0 \*/   
**$sigma**; /\* the standard deviation of the Gaussian, in pixels.e.g. 1 \*/   
**$amount**; /\* the percentage of the difference between the original and the blur image that is added back into the original. 50e.g. 1 \*/   
**$threshold**) /\* the threshold in pixels needed to apply the diffence amount.e.g. 0.05 \*/ 

### Parameters

| 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 |

### Result

Returns "OK" on success.

### Description

Replace image with a sharpened version of the original image using the unsharp mask algorithm.  
This function checks for a license.

Created 18th August 2014 , last changed 27th September 2022

  
[GMImage.Unsharpmask](GMImageUnsharpmask.md) - [GMImage.Wave](GMImageWave.md)

[HTML Version](GMImageUnsharpmaskChannel.shtml)