IsBlank(Int32,Single) Method

In This Topic

Detects if a GdPicture image or on an area of a GdPicture image defined by SetROI() method is blank.

Syntax

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

'Declaration

 

Public Overloads Function IsBlank( _

   ByVal ImageID As Integer, _

   ByVal Confidence As Single _

) As Boolean

public bool IsBlank( 

   int ImageID,

   float Confidence

)

public function IsBlank( 

    ImageID: Integer;

    Confidence: Single

): Boolean;

public function IsBlank( 

   ImageID : int,

   Confidence : float

) : boolean;

public: bool IsBlank( 

   int ImageID,

   float Confidence

)

public:

bool IsBlank( 

   int ImageID,

   float Confidence

)

Parameters

ImageID: GdPicture image identifier.
Confidence: Confidence threshold in the range [0 - 100]. Suggested value is 99.5.

Return Value

True if it is a blank image, else False.

Remarks

Use the GetStat() method to check if this method has completed successfully.

Example

Removing the blank pages from a tiff document.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())

{

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

    int imageID = gdpictureImaging.TiffCreateMultiPageFromFile("multipage.tif", true);

    int pageCount = gdpictureImaging.TiffGetPageCount(imageID);

    int pageNo = 1;

    while (pageNo <= pageCount)

    {

        gdpictureImaging.TiffSelectPage(imageID, pageNo);

        if (gdpictureImaging.IsBlank(imageID, 95))

        {

            gdpictureImaging.TiffDeletePage(imageID, pageNo);

            pageCount--;

        }

        else

        {

            pageNo++;

        }

    }

    gdpictureImaging.TiffSaveMultiPageToFile(imageID, "multipage.tif", TiffCompression.TiffCompressionAUTO);

    gdpictureImaging.ReleaseGdPictureImage(imageID);

}

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List