YCCRev (ImageKit Control/ Effect Method)

This method reverses the YCrCb values of a raster image.

[C++Builder] [ bool = ]imagekitcontrolname->Effect->YCCRev(const TPoint * Points, const int Points_Size, bool Yb, bool Cr, bool Cb)

[C++Builder] [ bool = ]imagekitcontrolname->Effect->YCCRev(bool Yb, bool Cr, bool Cb)

[Delphi] [ Boolean = ]imagekitcontrolname.Effect.YCCRev(const Points: array of TPoint; Yb, Cr, Cb: Boolean)

[Delphi] [ Boolean = ]imagekitcontrolname.Effect.YCCRev(Yb, Cr, Cb: 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
Yb	Reverses the Y component (luminance) of the YCrCb value (False(0): does not reverse value, True( nonzero): reverses value)
Cr	Reverses the Cr component (chrominance) of the YCrCb value (False(0): does not reverse value, True( nonzero): reverses value)
Cb	Reverses the Cb component (chrominance) of the YCrCb value (False(0): does not reverse value, True( nonzero): reverses value)

Return Value

Returns True if successful, otherwise returns False.

Explanation

The YCCRev method reverses the YCrCb values of a raster image. If the Yb, Cr, or Cb parameters are True, then that component of the YCrCb value is reversed. So, for example, the reverse of a Yb component = 255 would be a Yb component = 0. (Yb = 255 - Yb)

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

Before executing the YCCRev 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.

When a 1, 4, or 8 bit image is processed, the SelectMode property must be set to process the total image (i.e. SelectMode= 1). 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.