On Mar 11, 2008, at 8:43 PM, jeffupt wrote:
> I'm trying to use iText to output a PDF print file that is
> compatible with
> four color process screen printing.
>
OK - but you don't need halftone information for that.
> In this process, an RGB image is converted to CMYK and separated.
> Halftone
> films for each separation are printed using an imagesetter.
>
If you are dealing with a pure raster PDF - with no text and
vectors, then fine - you can pre-rasterize the image at whatever
screen., etc. you wish - but again, it's just an image. You can't do
that in PDF with text and vectors.
> Each separation must be printed at a different screen angle in
> order to
> minimize ink overlap. Currently, Adobe Illustrator is capable of
> letting
> one specify screen angles and frequency (lpi) for each halftone
> separation
> and outputting a PDF or PS file.
>
There are no such controls in Illustrator's "Save as PDF" dialog.
> The fact that this resulting PDF file can be printed correctly
> leads me to
> believe that this halftone information ( screen angle, frequency,
> dot shape
> ) is either embedded in the PDF/PS format - or that the image is
> pre-rastered before it's output.
>
The latter.
>
Leonard
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