[gs-devel] setoverprint question

[Dan Coby]

Alistair,

I cannot duplicate your problem.  I get one letter per bit plane.

I do not think that under color removal is your problem.

I would suggest that you check the follow things:

1.  You need to be using version Ghostscript 8.00 or later.  Massive
changes where made in Ghostscript handling of colors.  These changes
included the implementation of the over print and over print mode
features.  These changes also included changes in the device API.
So if your modified device was created prior to the 8.00 release
you should make sure that it has the appropriate changes.

2.  Be sure that the color_info.comp_bits, color_infor.comp_mask,
and color_info.comp_shift fields are correct for your device..  Also
verify that the color_info.polarity indicates subtractive.


Dan


-----Original Message-----
From: gs-devel-admin at ghostscript.com
[mailto:gs-devel-admin at ghostscript.com]On Behalf Of Alistair Braidwood
Sent: Tuesday, July 29, 2003 9:55 AM
To: gs-devel at ghostscript.com
Subject: [gs-devel] setoverprint question


Hi,

I'm having difficultly getting overprinting to work
properly when ripping to 1bit cmyk separations (via a
modified bitcmyk).

Specifically, I can't switch off under color removal
when I switch overprinting on.

In the following example, the black fullstop removes
the bottom centre of the other 3 letters, while they
do not affect each other.

----

<< /PageSize [400 400]
   /ProcessColorModel /DeviceCMYK
   /Separations true
>> setpagedevice

/.setoverprintmode where {pop 1 .setoverprintmode} if
true setoverprint

/Courier findfont 144 scalefont setfont

1 0 0 0 setcmykcolor 50 200 moveto (Q) show
0 1 0 0 setcmykcolor 50 200 moveto (E) show
0 0 1 0 setcmykcolor 50 200 moveto (U) show
0 0 0 1 setcmykcolor 50 200 moveto (.) show

showpage
----

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