Taco Hoekwater schrieb:

Peter Rolf wrote: you have to manually copy the

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hacker.jpg to your working directory (under linux e.g. with cp $(kpsewhich hacker.jpg) /path/to/your/working/directory) and change the path to make the minimal example work under mark iv.

I noticed this too (no picture with mkiv). BOF = Bug Or Feature :)

Multiple choice: [ ] Bug [x] Feature [x] The problem sits right before the monitor... Thanks Taco!

\setupexternalfigures[location={local,global,default}]

The default value of \setupexternalfigures is {local,global} and that does not actually search in the global texmf trees.

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

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Oliver Heins schrieb:

Hi Peter,

Peter Rolf writes:

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Oliver Heins schrieb:

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Hello,

with color black overprinting is not working. You can easily spot this when you use the »Ausgabevorschau« (sorry, my acrobat is in german locale, must be something with »preview« in english; located in the »tools« menu) in acrobat and remove magenta and black from the preview. Whilst under the region with the magenta colored text the picture gets shown, in the region with the black colored text the text is cut out of the picture, leaving white.

I think the visible 'knockedout' text on the picture is just another acrobat bug. I manually checked the text and the OVP attributes are correctly set. If you use the coloring mechanism (Ausgabenvorschau -> Farbwarnungen -> [x] Überdruck anzeigen), you will see that everything looks ok.

Yes, I noticed that, too. But to me it looks like it is first knocked out in the pdf, and then the overprint flag is set.

Good point. In that case the text must be set twice, as knockout and overprint can't coexist. I have looked into the uncompressed mkii PDF (\nopdfcompression) and I can not see any obvious flaw. The parts are clearly separeted by '/GSknockout gs' and '/GSoverprint gs', the black text is not set twice. Just an idea: the colorspace of the picture is RGB, the text is set in CMYK. Maybe the mixed color spaces mess up things here.

I made a document with scribus, which looks alright in acrobats preview: http://www.sopos.org/olli/overprinting-scribus.pdf

Same here. The difference is, that the picture here is also set in CMYK. So this points to the 'colorspace mess' theory too ;)

So I doubt that this is a bug in acrobat, but in context or even in pdftex/luatex.

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you have to manually copy the hacker.jpg to your working directory (under linux e.g. with cp $(kpsewhich hacker.jpg) /path/to/your/working/directory) and change the path to make the minimal example work under mark iv.

I noticed this too (no picture with mkiv). BOF = Bug Or Feature :)

Feature, as Taco kindly pointed out :-)

Regards, olli

On Fri, Dec 11, 2009 at 6:57 PM, Oliver Heins wrote:

But shouldn't the same effect be seen with other colors than black then, too?  And it only happens with black, and I think it happens even when you do it within a cmyk-only document:

Can you test the following?  My Acrobat is on a machine without net, and my usb stick broke within the experiments.

Best regards,  olli

\setupcolors[state=start, cmyk=yes, rgb=no]

\starttext

{\bfb\setstrut \startoverprint \framed [background=color,backgroundcolor=magenta, foregroundcolor=yellow,align={lohi,middle}, frame=off,width=3.5cm,height=3cm] {overprint\\\property[knockout]{knockout}}% \stopoverprint \framed [background=color,backgroundcolor=magenta, foregroundcolor=yellow,align={lohi,middle}, frame=off,width=3.5cm,height=3cm] {knockout\\\property[overprint]{overprint}}}%

{\bfb\setstrut \startoverprint \framed [background=color,backgroundcolor=magenta, foregroundcolor=black,align={lohi,middle}, frame=off,width=3.5cm,height=3cm] {overprint\\\property[knockout]{knockout}}% \stopoverprint \framed [background=color,backgroundcolor=magenta, foregroundcolor=black,align={lohi,middle}, frame=off,width=3.5cm,height=3cm] {knockout\\\property[overprint]{overprint}}}%

\stoptext

I have found this http://pages.cs.wisc.edu/~ghost/doc/cvs/Use.htm#SPOT -- luigi

Hi Peter, Peter Rolf writes:

I get the same 'kind of knockedout' text as in the other example... but the black text is set as /DeviceGray and not /DeviceCMYK (k-component). You can make this visible by using 'Vorschau: Separiert' with the option 'Einblenden: Nicht-DeviceCMYK'.

I think this is just a limitation of the previewer. You can define your own cmyk black with \definecolor[myblack][k=1]. I bet that the knockedout effect will vanish with cmyk black (untested).

You're right. With k=1, the 'kind of knockedout' vanishes. Thank you very much, Peter! So is it advisable to change all black to cmyk black or can I safely rely on the DeviceGray black?

...

Can you test the following? My Acrobat is on a machine without net, and my usb stick broke within the experiments.

prepress mess + bad luck => *have a break and enjoy your weekend* :)

Well, due to your kind help, I'm able to do so now :-) Thanks again, olli -- Oliver Heins heins@sopos.org http://oliverheins.net/ http://blog.overheins.net/ F27A BA8C 1CFB B905 65A8 http://scriptorium-adp.de/ 2544 0F07 B675 9A00 D827 1024D/9A00D827 2004-09-24 -- gpg --recv-keys 0x9A00D827 Please avoid sending me Word or PowerPoint attachments: http://www.gnu.org/philosophy/no-word-attachments.html

Oliver Heins wrote:

Hi Peter,

Peter Rolf writes:

...

I get the same 'kind of knockedout' text as in the other example... but the black text is set as /DeviceGray and not /DeviceCMYK (k-component). You can make this visible by using 'Vorschau: Separiert' with the option 'Einblenden: Nicht-DeviceCMYK'.

I think this is just a limitation of the previewer. You can define your own cmyk black with \definecolor[myblack][k=1]. I bet that the knockedout effect will vanish with cmyk black (untested).

You're right. With k=1, the 'kind of knockedout' vanishes. Thank you very much, Peter!

So is it advisable to change all black to cmyk black or can I safely rely on the DeviceGray black?

if needed i can make that an option at some point (as we already have more such auto conversion options) ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------

Am 12.12.2009 16:41, schrieb Oliver Heins:

Hi Peter,

Peter Rolf writes:

...

I get the same 'kind of knockedout' text as in the other example... but the black text is set as /DeviceGray and not /DeviceCMYK (k-component). You can make this visible by using 'Vorschau: Separiert' with the option 'Einblenden: Nicht-DeviceCMYK'.

I think this is just a limitation of the previewer. You can define your own cmyk black with \definecolor[myblack][k=1]. I bet that the knockedout effect will vanish with cmyk black (untested).

You're right. With k=1, the 'kind of knockedout' vanishes. Thank you very much, Peter!

You are welcome!

So is it advisable to change all black to cmyk black or can I safely rely on the DeviceGray black?

I donno. Best ask your printing house what they prefer in this case. Just an additional comment about prepress. A very good and gratis pdf book (only in german!) about prepress basics can be found here: http://www.cleverprinting.de/ratgeber2009.html Simply press "Jetzt als kostenloses PDF herunterladen" at the end of the page to get a copy. If you like it, buy it (as it's also very cheap for technical literature). Best wishes, Peter

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Can you test the following? My Acrobat is on a machine without net, and my usb stick broke within the experiments.

prepress mess + bad luck => *have a break and enjoy your weekend* :)

Well, due to your kind help, I'm able to do so now :-)

Thanks again, olli

Hi Luigi, luigi scarso writes:

hm I believed was

\color[red]{......}

and \startcolor[red] ... \stopcolor

You're right, I mixed things up here. But nontheless, my example was (unintendedly) syntactically correct, because either \color[black]{\bf ...} and \color[black]\startoverprint ... \stopoverprint define a block. :-)

see http://wiki.contextgarden.net/Colors

Anyway, thanks for pointing it out, because I really did not know of the \startcolor-syntax (I'm new to context). Regards, olli -- Oliver Heins heins@sopos.org http://oliverheins.net/ http://blog.overheins.net/ F27A BA8C 1CFB B905 65A8 http://scriptorium-adp.de/ 2544 0F07 B675 9A00 D827 1024D/9A00D827 2004-09-24 -- gpg --recv-keys 0x9A00D827 Please avoid sending me Word or PowerPoint attachments: http://www.gnu.org/philosophy/no-word-attachments.html

luigi scarso writes:

On Fri, Dec 11, 2009 at 5:37 PM, Oliver Heins wrote:

...

Hi Luigi,

luigi scarso writes:

...

hm I believed  was

\color[red]{......}

and \startcolor[red] ... \stopcolor

You're right, I mixed things up here.  But nontheless, my example was (unintendedly) syntactically correct, because either \color[black]{\bf ...} and \color[black]\startoverprint ... \stopoverprint define a block. :-) ok, just to be sure : can you rewrite in a correct way ? Can be a problem with mkii .

Okay. But I don't see any difference. Regards, olli \setupcolors[state=start,cmyk=yes,rgb=no] \definelayer [mybg] [x=0mm, y=0mm, width=\paperwidth, height=\paperheight, repeat=yes] \setlayer [mybg] [hoffset=5cm, voffset=7cm] {\externalfigure[sample/hacker.jpg][max]} % {\externalfigure[hacker.jpg][max]} \setupbackgrounds[page][background=mybg] \starttext {\bf With foregroundcolor = magenta.} \startcolor[magenta] \startoverprint \input tufte \stopoverprint \stopcolor {\bf With foregroundcolor = black. \color[magenta]{(Some magenta without overprint)}} \startcolor[black] \startoverprint \input tufte \stopoverprint \stopcolor \stoptext -- Oliver Heins heins@sopos.org http://oliverheins.net/ http://blog.overheins.net/ F27A BA8C 1CFB B905 65A8 http://scriptorium-adp.de/ 2544 0F07 B675 9A00 D827 1024D/9A00D827 2004-09-24 -- gpg --recv-keys 0x9A00D827 Please avoid sending me Word or PowerPoint attachments: http://www.gnu.org/philosophy/no-word-attachments.html