FxNegative Method (GdPictureImaging)

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Performs a negative effect (color inversion) on a GdPicture image or on an area of a GdPicture image defined by SetROI() method.

Syntax

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

'Declaration
 
Public Function FxNegative( _
   ByVal ImageID As Integer _
) As GdPictureStatus

public GdPictureStatus FxNegative( 
   int ImageID
)

public function FxNegative( 
    ImageID: Integer
): GdPictureStatus;

public function FxNegative( 
   ImageID : int
) : GdPictureStatus;

public: GdPictureStatus FxNegative( 
   int ImageID
)

public:
GdPictureStatus FxNegative( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

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

Example

Performing a negative effect on a GdPicture image.

Applying a negative effect on a single jpeg 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.jpg", true);
    gdpictureImaging.FxNegative(imageID);
    gdpictureImaging.SaveAsJPEG(imageID, "image.jpg", 75);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Applying the fire effect and negative effect to two duplicates of the same image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // Create two duplicate gdpicture images from the input file.
    int imageID1 = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
    int imageID2 = gdpictureImaging.CreateClonedGdPictureImage(imageID1);
 
    // Process both of your images (differently).
    gdpictureImaging.FxFire(imageID1);
    gdpictureImaging.FxNegative(imageID2);
 
    // Save your images in the same multipage tif file.
    gdpictureImaging.TiffSaveAsMultiPageFile(imageID1, "images.tif", TiffCompression.TiffCompressionAUTO);
    gdpictureImaging.TiffAddToMultiPageFile(imageID1, imageID2);
    gdpictureImaging.TiffCloseMultiPageFile(imageID1);
    gdpictureImaging.ReleaseGdPictureImage(imageID1);
    gdpictureImaging.ReleaseGdPictureImage(imageID2);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
CreateGdPictureImageFromFile(String) Method
ReleaseGdPictureImage Method