RGBRev (ImageKit Control/ Effect Method)

This method reverses the RGB values of a raster image.

[C++Builder] [ bool = ]imagekitcontrolname->Effect->RGBRev(const TPoint * Points, const int Points_Size, bool Red, bool Green, bool Blue)

[C++Builder] [ bool = ]imagekitcontrolname->Effect->RGBRev(bool Red, bool Green, bool Blue)

[Delphi] [ Boolean = ]imagekitcontrolname.Effect.RGBRev(const Points: array of TPoint; Red, Green, Blue: Boolean)

[Delphi] [ Boolean = ]imagekitcontrolname.Effect.RGBRev(Red, Green, Blue: Boolean)

Parameters

Name	Explanation
Points	An array of x and y coordinate values defining points of a polygonal area on the image. (in pixels) In C++Builder, the size of the Points array is given by Points_Size - 1
Red	Reverses the red component of the RGB value (False(0): does not reverse value, True( nonzero): reverses value)
Green	Reverses the green component of the RGB value (False(0): does not reverse value, True( nonzero): reverses value)
Blue	Reverses the blue component of the RGB value (False(0): does not reverse value, True( nonzero): reverses value)

Return Value

Returns True if successful, otherwise returns False.

Explanation

The RGBRev method reverses the RGB values of a raster image. If the Red, Green, or Blue parameters are True, then that component of the RGB value is reversed. So, for example, the reverse of a red component = 255 would be a red component = 0. (Red = 255 - Red)

To execute the RGBRev method, set the image handle of the image in the ImageHandle property or the Layer(LayerNo).ImageHandle property. The RGBRev method supports 1, 4, 8, 16, 24, and 32 bit images.

Before executing the RGBRev method, you must set the area on the image that will be affected. There are 4 ways to do this.

To use a mask image, set the SelectMode property to vikEffectMask. Set the mask image handle in the MaskImageHandle property
To process the total image, set the SelectMode property to vikEffectAll.
To process the polygonal area on the image, set the SelectMode property to vikEffectPolygon. Select the polygon by setting the appropriate coordinate values for the points of the polygon in the Points array. The number of points defining the polygon must be 3 or more.
To process an elliptical area on the image, set the SelectMode property to vikEffectEllipse. Select the ellipse by setting the appropriate values for the bounding rectangle in the RectLeft, RectTop, RectRight, and RectBottom properties

When the SelectMode property is set to vikEffectPolygon or vikEffectEllipse, the InOut property should be set. When the SelectMode property is set to values other than vikEffectPolygon, please set the Points parameter to a dummy array or to NULL.

If successful the resulting raster image data is set in the LayerNo property (the ImageHandle property or the Layer(LayerNo).ImageHandle property. If unsuccessful, 0 is returned.

When the Caption, Message, and ButtonName properties are blank, the progress dialog box will not be displayed. When the progress dialog box is displayed, the percentage that the processing has completed will be shown in the dialog box.

Differences from the ImageKit 7/8/9/10 ActiveX

The parameters x, y have been changed to type TPoint
In Delphi, it is not necessary to pass the size of the array of x, y points.