public void RecompressWithGroup4Fax()
Public Sub RecompressWithGroup4Fax
Using Group 4 CCITT facsimile (fax) encoding will cause image data to be converted to bilevel (black-and-white) format if necessary.
The threshold level is set to default value (189) during recompression.
This method throws UnsupportedImageException when used on an inline image. You can check IsInline property before invoking this method.
For a mask image, this method emits a warning in logs and does nothing. A mask image is an image with IsMask equal to true.