SetContrast Method (GdPictureImaging)

In This Topic

Adjust the Contrast in a GdPicture image or in the area defined by SetROI() method.

Syntax

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

'Declaration
 
Public Function SetContrast( _
   ByVal ImageID As Integer, _
   ByVal Contrast As Integer _
) As GdPictureStatus

public GdPictureStatus SetContrast( 
   int ImageID,
   int Contrast
)

public function SetContrast( 
    ImageID: Integer;
    Contrast: Integer
): GdPictureStatus;

public function SetContrast( 
   ImageID : int,
   Contrast : int
) : GdPictureStatus;

public: GdPictureStatus SetContrast( 
   int ImageID,
   int Contrast
)

public:
GdPictureStatus SetContrast( 
   int ImageID,
   int Contrast
)

Parameters

ImageID: GdPicture image identifier.
Contrast: Contrast adjustment between -100 and 100.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

This method is used in the "Image Processing" Demo.

Example

Change image contrast using random value and saves result into a PNG file.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("input.png");
 
    // Change image contrast using random value. Allowed values are from -100 to +100.
    Random random = new Random();
    int contrast = random.Next(-100, 100);
    gdpictureImaging.SetContrast(imageID, contrast);
 
    gdpictureImaging.SaveAsPNG(imageID, "output.png");
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
SetROI Method
ResetROI Method
SetBCSG Method