This method increases (or decreases) the YCrCb values of a raster image.
Parameters
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)
Return Value
Returns True if successful. Returns False if unsuccessful.
Explanation
The YCCLevel method increases or decreases the YCrCb values in 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.
To execute the YCCLevel method, set the image handle of the image in theImage property or the Layer(LayerNumber).Image property. The YCCLevel method supports 1, 4, 8, 16, 24, and 32 bit images.
Before executing the YCCLevel 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 EffectMask. Set the mask image handle in the SourceMask property
- To process the total image, set the SelectMode property to EffectAll
- To process the polygonal area on the image, set the SelectMode property to EffectPolygon. Select the polygon by setting the appropriate coordinate values for the points of the polygon in the Point property
- To process an elliptical area on the image, set the SelectMode property to EffectEllipse. Select the ellipse by setting the appropriate values for the bounding rectangle in the Rect property
When the SelectMode property is set to EffectPolygon or EffectEllipse, the appropriate values must be set in the Inside property. When a 1, 4, or 8 bit image is processed, the total image will be processed regardless of the value set in the SelectMode property.
If the YCCLevel method is successful and the DestinationAsImageKitImage property is True, the resulting image will be set in the Image property or in the Layer(LayerNumber).Image property, according to the value set in the LayerNumber property.
If the YCCLevel method is successful and the DestinationAsImageKitImage property is False, the resulting image will be set in the DestinationImage property.