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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 2.0 ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
MBS( "GMImage.UnsharpmaskChannel"; ImageRef; ChannelType; radius; sigma; amount; threshold )   More

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 - GMImage.Wave