Re: overprint simulation of spot colors - change from 9.16 to 9.19?

Ulf Wittenberg <[email protected]>
Newsgroups gmane.comp.printing.ghostscript.devel
Message-ID <[email protected]>
Hi Ken,

thanks for the answer! I guess I’ve found the reason:
http://bugs.ghostscript.com/show_bug.cgi?id=695916#c7

Comment says the following:
> Michael Vrhel 2015-04-12 10:54:35 PDT
> Fixed with http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=e8142ce7390e2686456894a602df07d8de16a7c7
> 
> This was caused by the simulated overprinting work that had been done sometime ago.  Unfortunately this method is not adequate for every case and we need to do this in a different fashion. Simulated overprinting of spot colors is therefore removed for now (for non-separation devices).


Since this commit came after the 9.16 release, 9.16 still does ovp sim of spot colors.

Do you by chance have any insight about the status of the new method mentioned in
http://bugs.ghostscript.com/show_bug.cgi?id=695925?


Best Regards,
Ulf




> Am 31.05.2016 um 16:13 schrieb Ken Sharp <[email protected]>:
> 
> At 16:04 31/05/2016 +0200, Ulf Wittenberg wrote:
> 
>> Does anybody have an explanation for this change in behavior?
> 
> Most likely some change to address a different problem caused this. You can use Git to bisect the commits and find what precise commit changed the behaviour if you really want to.
> 
> However, the problem (or what sounds like it) is not unknown, see :
> 
> http://bugs.ghostscript.com/show_bug.cgi?id=696023
> 
> and
> 
> http://bugs.ghostscript.com/show_bug.cgi?id=695925
> 
> If you want someone to look at it specifically, you'll need to open a bug report with full details and files required to reproduce the problem.
> 
>                        Ken
>
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