CropBlackBordersEx(Int32,Single) Method

In This Topic

Detects and sets to White, margins consisting of black color around a GdPicture image. This method does not have the same behavior as the CropBlackBorders() method: The black borders are not removed but are set to blank. Therefore, the image dimensions are kept the same. It has a Confidence Parameter where if the lines and borders detection confidence exceeds this value they will be set as blank, and left as they are if the confidence in detecting them is less than the Confidence Parameter Value.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration

 

Public Overloads Function CropBlackBordersEx( _

   ByVal ImageID As Integer, _

   ByVal Confidence As Single _

) As GdPictureStatus

public GdPictureStatus CropBlackBordersEx( 

   int ImageID,

   float Confidence

)

public function CropBlackBordersEx( 

    ImageID: Integer;

    Confidence: Single

): GdPictureStatus;

public function CropBlackBordersEx( 

   ImageID : int,

   Confidence : float

) : GdPictureStatus;

public: GdPictureStatus CropBlackBordersEx( 

   int ImageID,

   float Confidence

)

public:

GdPictureStatus CropBlackBordersEx( 

   int ImageID,

   float Confidence

)

Parameters

ImageID: GdPicture image identifier.
Confidence: Confidence threshold in percentage. Default value is 75.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

This method only detects rectangular borders, for all types of borders, including ones that are resultant from deskewing, or bad scanning, please use DeleteBlackBorders() instead.

This method requires the Image Documents component to run.

Example

Whitening the black margins on a black and white tiff image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())

{

    // LoadInMemory parameter is set to true in order to be able to update the input file.

    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.tif", true);

 

    // Detect and set to white the black margins using the custom confidence level.

    gdpictureImaging.CropBlackBordersEx(imageID, 99);

    

    gdpictureImaging.SaveAsTIFF(imageID, "image.tif", TiffCompression.TiffCompressionCCITT4);

    gdpictureImaging.ReleaseGdPictureImage(imageID);

}

Example

Whitening the black margins on a black and white tiff image. using (GdPictureImaging gdpictureImaging = new GdPictureImaging()) { // LoadInMemory parameter is set to true in order to be able to update the input file. int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.tif", true); // Detect and set to white the black margins using the custom confidence level. gdpictureImaging.CropBlackBordersEx(imageID, 99); gdpictureImaging.SaveAsTIFF(imageID, "image.tif", TiffCompression.TiffCompressionCCITT4); gdpictureImaging.ReleaseGdPictureImage(imageID); }

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List
DeleteBlackBorders Method