IKYCCLevel

This function increases (or decreases) the YCrCb values of a raster image.

[C++Builder/Visual C++] HANDLE IKYCCLevel(PTR_IKSELECT_IMAGE SrcHandle, BYTE SelectMode, LPPOINT lpPoint, int Points, LPRECT Rect, BOOL InOut, int Yb, int Cr, int Cb, IKPROCESSPROC UserProc, LPCTSTR Caption, LPCTSTR Message, LPCTSTR Button);

[Delphi] function IKYCCLevel(var SrcHandle: IKSELECT_IMAGE; SelectMode: Byte; var lpPoint: TPoint; Points: Integer; var Rect : TRect; InOut: LongBool; Yb, Cr, Cb: Integer; UserProc: LONG_PTR; Caption, Message, Button: PChar): THandle;

[Visual Basic] Function IKYCCLevel(SrcHandle As IKSELECT_IMAGE, ByVal SelectMode As Byte, lpPoint As IKPOINT, ByVal Points As Long, Rect As IKRECT, ByVal InOut As Long, ByVal Yb As Long, ByVal Cr As Long, ByVal Cb As Long, ByVal UserProc As Long, ByVal Caption As String, ByVal Message As String, ByVal Button As String) As Long

Parameters

Name	Explanation
SrcHandle	A structure containing the image handle and the mask image handle member variables hImgBmh can be 1, 4, 8, 16, 24, or 32 bit images
SelectMode	Sets the method for selecting the area on the image that will be processed (0: Mask handle, 1: Total image, 2: Polygon, 3: Ellipse)
lpPoint	A structure defining coordinates for the points of the polygonal area on the image. (This parameter is enabled when SelectMode is 2) In C++Builder and Visual C++, pass the pointer to the first element in the structure array. In Delphi, if Pt is an array of TPoint, then the arguments are returned in the first elements of the array Pt[0] In Visual Basic, if Pt is an array of IKPOINT, then the arguments are returned in the first elements of the array Pt(0)
Points	The number of points defining the polygonal area on the image, i.e. the number of points in the lpPoint array (This parameter is enabled when SelectMode is 2).
Rect	A structure specifying the coordinates for the rectangle bounding the elliptical area on the image (This parameter is enabled when SelectMode is 3)
InOut	Determines whether the area inside the selected area will be processed or the area outside the selected area will be processed. Enabled for polygon and ellipse (SelectMode is 2 or 3). If False (0), the area outside the selected area is processed. If True (nonzero) the area inside the selected area is processed.
Yb	Sets the shift in the Y component (luminance) of the YCrCb value (from -255 to 255)
Cr	Sets the shift in the Cr component (chrominance) of the YCrCb value (from -255 to 255)
Cb	Sets the shift in the Cb component (chrominance) of the YCrCb value (from -255 to 255)
UserProc	The address of the user function (If not using the user function then set to 0)
Caption	Sets the text displayed in the title bar of the progress dialog box
Message	Sets the message displayed in the progress dialog box
Button	Sets the name of the button displayed in the progress dialog box

Return Value

Returns the raster image handle if successful. Returns 0 if unsuccessful.

Explanation

The IKYCCLevel function increases (or decreases) the YCrCb values of a raster image. Y represents luminance, Cr and Cb represent chrominance. As the values of the Yb, Cr, or Cb parameters increase, the image becomes brighter. As those values decrease, the image becomes darker. If the Yb, Cr, or Cb parameters are 0, the image is not altered.

Before executing this function, 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 SelectMode to 0. Then set the mask image handle in SrcHandle.
To process the total image, set SelectMode to 1.
To process the polygonal area on the image, set SelectMode to 2. Select the polygon by setting the appropriate coordinate values for the points of the polygon in the lpPoint structure. Then set the number of points defining the polygon in Points (must be 3 or more).
To process an elliptical area on the image, set SelectMode to 3. Select the ellipse by setting the appropriate values for the bounding rectangle in the Rect structure.

For the lpPoint and Rect structure members, coordinate points are in pixel units. When SelectMode is set to a value other than 2, set a dummy array in lpPoint and set Points to 0. When SelectMode is set to a value other than 3, then set a dummy array in Rect. When processing a 1, 4 or 8 bit image, the whole image will be processed regardless of the value of the SelectMode.

Note: the image handles passed to IKSELECT_IMAGE are NOT automatically freed after executing this function.

If the user function is set or if the Caption, Message, and Button parameters are blank then the Progress dialog box is not displayed. If the Progress dialog box is displayed, it indicates the percentage of the current process completed. For more information about the user function please refer to the Definition of User Function in the Ik9Effect.dll, Ik9EffectA.dll, Ik9Effect64.dll, Ik9Effect64A.dlll section.