Documentation / Marblecore Imaging / Methods / FilterThreshold
FilterThreshold method
Applies a threshold effect to the image.
Syntax
Boolean FilterThreshold(nLevel As Number, nColorLow As Number, nColorHigh As Number, nLeft As Number, nTop As Number, nWidth As Number, nHeight As Number)
Return value
Returns true if the function succeeded.
Parameters
Parameter | Type | Required | Description |
nLevel | Number | Yes | Specifies the threshold level (ranging from 0...255). |
nColorLow | Number | No | Optional parameter which specifies the low level color. |
nColorHigh | Number | No | Optional parameter which specifies the high level color. |
nLeft | Number | No | Optional parameter which can be used to specify a clipping rectangle. This parameter specifies the left coordinate of the rectangle. |
nTop | Number | No | Optional parameter which can be used to specify a clipping rectangle. This parameter specifies the top coordinate of the rectangle. |
nWidth | Number | No | Optional parameter which can be used to specify a clipping rectangle. This parameter specifies the width of the rectangle. |
nHeight | Number | No | Optional parameter which can be used to specify a clipping rectangle. This parameter specifies the height of the rectangle. |
Example
The example below shows the effect of this method and how to use it. You can slide the marker in the before/after picture to see the difference. If you take a look at the example code, assume there is a reference to the Marblecore Imaging object with the name 'MarblecoreImaging'. Transparent parts of the image are displayed using a checkerboard pattern.
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2 MarblecoreImaging.LoadFromFile("example-filterthreshold-before.jpg");
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5 MarblecoreImaging.FilterThreshold(100);
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8 MarblecoreImaging.SaveToFile("example-filterthreshold-after.jpg");
Category
Filters, Color
See also
FilterEdgeDetect |
FilterHalftone |
FilterSolarize