Leonard Rosenthol schrieb:
At 10:29 PM +0100 2/24/03, Carsten Hammer wrote:
Does itext allow one to setup the transparency of a text?
Do you the Acrobat 5 full transparency model? If so, no it doesn't.
Yes I mean exactly this. The transparency color model that Adobe introduced with the latest pdf standard.
I want to use it for high quality (slow as hell) watermarks..
Why do you they would be slow?
Just try them out. The Acrobat SDK contains a Watermark plugin example.
You can easily add transparent text using it. Of course Acrobat is not free.
But if you print them you see your printer rasterizing a long time if it is able to do it at all. The pdf transparency effects need the raster engine to hold the full page in memory twice and they seem to be not very optimized most of the time.
And are you planning on these for onscreen or print (or both)?
I used them for text watermarks in print sometimes although they are slow (for the printer, not for the application that adds them) because of their superior quality on suitable printers.
LDR
To answer the question of Paulo:
the full transparency color model allows to put a grey text(or whatever) on the top of your pdf page. This "overlay" can then be not completely opaque but modify the color of the underlying pixels by an configurable algorithm. It looks like looking through colored glass.
This color model is completely different than the cmyk color model of offset print.
If you would like to get some examples look at http://www.tinaja.com/glib/pstrans.pdf
Best regards, Carsten Hammer
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