getDeviceNPicture
Get a Picture object for one DeviceN color channel.
getDeviceNPicture([in] int channelIdx, [out, retval] IUnknown **pic)
This function retrieves the Picture object (OLE
IPicture
interface) for the specified channel generated by the last call to
convertPageToDeviceNImage.
The Picture will be an 8-bit grayscale bitmap, indicating the level of the specific colorant at each pixel.
The channel bitmaps returned by getDeviceNPicture will
all have the same width and height.
VB:
rast.convertPageToDeviceNImage(page, dpi)
nChannels = rast.getNumDeviceNChannels()
For i = 0 To nChannels-1
channelName = rast.getDeviceNChannelName(i)
channelCMYK = rast.getDeviceNChannelCMYK(i)
pic = rast.getDeviceNPicture(i)
' each channel has an 8-bit grayscale bitmap, similar to what
' is returned by convertPageToPicture in imageGray mode
...
Next i
rast.clearDeviceNImage()