convertPageToDeviceNImage
Convert a page to a DeviceN image.
convertPageToDeviceNImage([in] int page, [in] double dpi)
This function rasterizes a page in DeviceN mode, i.e., with separate
color channels for each process color (cyan, magenta, yellow, and
black), and for each custom (a.k.a., spot) color.
After calling convertPageToDeviceNImage:
- call
getNumDeviceNChannelsto retrieve the number of color channels - call
getDeviceNChannelNameandgetDeviceNChannelCMYKto get the name and CMYK value for a particular channel - call
getDeviceNPictureto get a bitmap for a particular channel
clearDeviceNImage to release the memory used by
convertPageToDeviceNImage.
To enable an overprint preview rasterization, call setConfig to
set the overprintPreview parameter before
calling convertPageToDeviceNImage:
pdf.setConfig "overprintPreview yes"
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()