[softwarelist] Re: OPW - PDF - Printing
- From: Clive Bonsall <cbonsall@xxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Wed, 03 Dec 2008 12:43:39 +0000
David Pilling wrote:
In message <op.ulky1sq57kyep4@xxxxxxxxxxxxxxx>, Clive Bonsall
<cbonsall@xxxxxxx> writes
I woke up at 5am and thought of an answer to this...
There is the concept of "overprint" or its opposite "knock out". This
refers to what happens when colours are overlaid on a printer.
Say you have an area of red, and an area of green is printed on top of
it. There are two possible approaches, overprint where the green paint
is placed on top of the red OR knock out where the red paint is removed
from the area and the green is put on to the resulting white.
Imagine that instead of green you're dealing with white (which was the
problem case), here there is no final coat of paint, white is an absence
of ink. If you have knockout set then you'll see something, if you have
overprint set you won't.
Now in the last version of OPW I changed the PostScript generation so
that the overprint setting has an effect in composite files (it has
always worked in separations).
My guess is that your white is set to overprint and one of the PS
interpreters understands the overprint command. The solution is to
change the overprint setting. This can be done at the colour or object
level, unless you're actually setting overprint deliberately, best
turned off at the colour level.
You can use the View->separations menu to see the effect of overprint
settings.
Sorry for disturbing your sleep. In my setup OVERPRINT is OFF by default
in the Object>Modify>Fillcolour menu and the Text>Modify text>Foreground
menu, and I would expect that it was set to off in all the relevant
documents/frames. But I will create some test documents with various
settings and see what happens.
--
C.B.
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