Bug in overprint? (was: how to set overprint)

Bug in overprint? (was: how to set overprint)

[Jano Kula]

[-- Attachment #1.1: Type: text/plain, Size: 1169 bytes --]

Hello,

may I ask someone, who understands knockout and overprint in the printing
press, to check test cases in the attached file from the test suite, if
overprint is working or not in Mark IV, please?

Regards,
Jano


On Fri, 30 Oct 2020 at 11:02, Jano Kula <jano.kula@gmail.com> wrote:

>
>
> On Thu, 29 Oct 2020 at 23:12, Jano Kula <jano.kula@gmail.com> wrote:
>
>> Hello,
>>
>> whatever I try, I cannot get the overprinting right (checked in Output
>> Preview of Acrobat). Even overprint-001.tex from the test suite
>> (2020-09-19) doesn't seem to have it right (latest beta). What I'm missing
>> here?
>>
>> \setupcolors[intent=overprint]
>> \startTEXpage[offset=10mm]
>> \framed[frame=on,offset=10mm,
>>         background=color,backgroundcolor=darkgreen]{
>> %         \startcolorintent[overprint]
>>         \startoverprint
>>         text in black
>>         \stopoverprint
>> %         \stopcolorintent
>>         }
>> \stopTEXpage
>>
>> Thank you,
>> Jano
>>
>
> Forgot to say, I've also tried to add
> \setupcolors[state=start,rgb=no,cmyk=yes]
> though I think, at least state=start isn't needed anymore.
> It doesn't change the overprint issue.
>
> Jano
>

[-- Attachment #1.2: Type: text/html, Size: 2216 bytes --]

[-- Attachment #2: overprint-001.tex --]
[-- Type: application/x-tex, Size: 1298 bytes --]

[-- Attachment #3: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Bug in overprint? (was: how to set overprint)

[Andres Conrado Montoya Acosta]

[-- Attachment #1.1: Type: text/plain, Size: 452 bytes --]

>
> may I ask someone, who understands knockout and overprint in the printing
> press, to check test cases in the attached file from the test suite, if
> overprint is working or not in Mark IV, please?
>
> Regards,
> Jano
>
>
Hi Jano, as far as I can check with my pdf editors, it seems overprinting
is working. The black ink is printed above the blue, with no white reserve
below it.

-- 
Andrés Conrado Montoya
http://chiquitico.org

[-- Attachment #1.2: Type: text/html, Size: 958 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Bug in overprint? (was: how to set overprint)

[Jano Kula]

[-- Attachment #1.1: Type: text/plain, Size: 1271 bytes --]

Hello Andrés!

On Wed, 11 Nov 2020 at 01:25, Andres Conrado Montoya Acosta <
elandi@chiquitico.org> wrote:

> may I ask someone, who understands knockout and overprint in the printing
>> press, to check test cases in the attached file from the test suite, if
>> overprint is working or not in Mark IV, please?
>>
>> Regards,
>> Jano
>>
>>
> Hi Jano, as far as I can check with my pdf editors, it seems overprinting
> is working. The black ink is printed above the blue, with no white reserve
> below it.
>

Sorry for the delay, I had to downsample the screenshots after the original
reply didn't get through (too big) and in the end remove them completely.

Thank you for checking. Looks like a bug in Acrobat (older version
11.0.23), not ConTeXt.
What editors do you use?

After your test I was digging deeper. When I disable black plate in *Preview:
Separations* it doesn't show an overprint, the room under the letters is
white (original problem). When I remove one overprint manually in
Illustrator, Acrobat shows the remaining overprints. I've found out later,
I could use *Profile: Color Warnings*, where all overprints are visible,
but I would rather see it in separated plates.

Hope this helps someone in the future, too.
Jano

[-- Attachment #1.2: Type: text/html, Size: 1893 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Bug in overprint? (was: how to set overprint)

[Andres Conrado Montoya]

[-- Attachment #1.1: Type: text/plain, Size: 955 bytes --]

> What editors do you use?

I checked using Acrobat X on windows, PDFStudio 12 and Master PDF Editor on
linux

-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
----------------------------------------
Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
----------------------------------------

“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell

[-- Attachment #1.2: Type: text/html, Size: 1428 bytes --]

[-- Attachment #2: Type: text/plain, Size: 493 bytes --]

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________