This method retrieves the digital watermark from a raster image.
Parameters
keyImage
The original image.
This is the image without a digital
watermark.
It is used as a key to compare to another image
and check if a watermark exists (24 bit color images only).
secretImage
The image that contains the watermark (24 bit
color images only)
level
The level at which to retrieve the watermark
(From -20 to 20)
Return Value
Returns True if successful. Returns False if unsuccessful.
Explanation
The CheckSecretImage method retrieves the digital watermark from an image whose watermark has been set with the SetSecretImage method. It CANNOT retrieve other types of watermarks.
The Level parameter should be set to a value that is the same as or slighly smaller than the Level at which the watermark was embedded into the image using the SetSecretImage method. Using a Level to retrieve the watermark that differs significantly from the Level at which the watermark was set will result in no watermark being retrieved. Furthermore, the orginal image and the watermarked image must be exactly the same size. If either image has been resized, no watermark can be retrieved.
If successful the resulting raster image handle is set in the Image property or the Layer(LayerNumber).Image property depending on the value set in the LayerNumber property. The CheckSecretImage method supports only 24 bit color images. The resulting image has a black background with the digital watermark appearing in white. (It is a 1-bit image that is the same size as the images set in keyImage and secretImage.)
See Also
ImageKit.Effect Members | Newtone.ImageKit.Wpf.ImageKit