We are looking at moving a bunch printing code from Postscript to PDF.
We have a large set of monochrome CCITT TIFF images that are used on
various documents. Some of these images need to be screened to appear
gray. In Postscript I was able to accomplish this by adding a Decode to
the image attributes like this:
/Decode [GrayScaleValue 1.0]
Our RIP then sees the gray and does its screening algorithm.
I see that PDF also supports /Decode and I was able to insert a line of
code into PdfImage.cs that does the job as follows.
Put(PdfName.DECODE, new PdfLiteral("[0.5 1.0]"));
Is there any "official" way to have iTextSharp output that or should I
perhaps be thinking about this in a different way? I tried playing
around with the "Additional" PDFDictionary object that you can set on an
image, but the PdfImage.cs code bypasses that for CCITT images.
Allen
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