Method SetBitonalThreshold

Namespace

BitMiracle.Docotic.Pdf

Assembly

BitMiracle.Docotic.Pdf.dll

SetBitonalThreshold(int)

Sets the threshold level to use when producing bitonal images.

public TiffImageCompressionOptions SetBitonalThreshold(int threshold)

Parameters

threshold int

The threshold level to use while producing bitonal images.

Returns

TiffImageCompressionOptions

The instance used to call the method.

Remarks

The threshold level is used to decide which pixels are white and which are black when converting image data to black-and-white format.

The threshold level value must be between 0 and 255 inclusive. A threshold value 0 means that library should use midpoint between most light and dark pixels as a threshold value.

If the image contains some scanned document or other data with mostly white background pixels and mostly black foreground pixels then threshold level of 189 or higher is recommended to preserve most of the data.

Check the Convert PDF to bitonal or grayscale images in .NET section of the Convert PDF to image in C# and VB.NET article. The section describes how to create black-and-white TIFF images.