Re: [NTG-context] Black generation in cmyk output
On Tue, Dec 07, 2004 at 10:40:35AM +0100, Tobias Hilbricht wrote: > Am Do, den 02.12.2004 schrieb Taco Hoekwater um 11:10: > > Just curious: why do you need a cmyk pdf document? > > Of course you can leave colour space conversion and colour separation to > the printer (provided the printer has the means to do so). However, for > full control over the print colours it is better to have a calibrated > monitor and a document in the CMYK colourspace - then you see what the > colours a likely to look like, and dependency on the printer is reduced. > Agencies, which prepare graphics for advertisements, pay thousands of > Euros to be able to control the correct outcome of corporate colours or > skin colours, for example. > > Yours sincerely > > Tobias Hilbricht CMYK is considered a device-dependent colorspace, which takes press conditions into account. So you are more, not less dependent on your printer by going for CMYK. At least, this is the theory. Anyhow, it is a good idea to discuss color with your printshop if color fidelity is an issue. -- Siep Kroonenberg ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Am Do, den 02.12.2004 schrieb Taco Hoekwater um 11:10: > Just curious: why do you need a cmyk pdf document? Of course you can leave colour space conversion and colour separation to the printer (provided the printer has the means to do so). However, for full control over the print colours it is better to have a calibrated monitor and a document in the CMYK colourspace - then you see what the colours a likely to look like, and dependency on the printer is reduced. Agencies, which prepare graphics for advertisements, pay thousands of Euros to be able to control the correct outcome of corporate colours or skin colours, for example. Yours sincerely Tobias Hilbricht ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
On Fri, Dec 03, 2004 at 11:00:54AM +0100, Piotr Kopszak wrote: > On Thu, Dec 02, 2004 at 11:10:51AM +0100, Taco Hoekwater wrote: > > > > Just curious: why do you need a cmyk pdf document? I'm asking because the > > requirement often implies that you are using a less-than-modern printing > > house. If that is the case, you may be better off using PostScript instead > > of PDF. > > > > Greetings, Taco > > Actually, I was asked once to deliver one, because the printing house > charged extra money for processing rgb pdf. But true, this time I > simply need postscript output. Hence another question. I was asked to > deliver all pages as separate EPS files. I was using ghostscript to > obtain individual pages but is there any option to get all pages in > the document as separate files using ConTeXt? > > Piotr pdftops, part of the xpdf suite, should be able to do that with something like pdftops -eps -paper match -f pageno -l pageno file.pdf file_pageno.eps -- Siep Kroonenberg ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Piotr Kopszak wrote: Actually, I was asked once to deliver one, because the printing house charged extra money for processing rgb pdf. But true, this time I simply need postscript output. Hence another question. I was asked to deliver all pages as separate EPS files. I was using ghostscript to obtain individual pages but is there any option to get all pages in the document as separate files using ConTeXt? Not easily (the ghostscript approach is definately better). Greetings, Taco ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
On Thu, Dec 02, 2004 at 11:10:51AM +0100, Taco Hoekwater wrote: > > Just curious: why do you need a cmyk pdf document? I'm asking because the > requirement often implies that you are using a less-than-modern printing > house. If that is the case, you may be better off using PostScript instead > of PDF. > > Greetings, Taco Actually, I was asked once to deliver one, because the printing house charged extra money for processing rgb pdf. But true, this time I simply need postscript output. Hence another question. I was asked to deliver all pages as separate EPS files. I was using ghostscript to obtain individual pages but is there any option to get all pages in the document as separate files using ConTeXt? Piotr -- Piotr Kopszak, Ph.D. Polish Art Gallery, National Museum in Warsaw ->http://kopszak.mnw.art.pl/ http://www.magnatune.com/artists/altri_stromenti ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Taco Hoekwater wrote: Just curious: why do you need a cmyk pdf document? I'm asking because the requirement often implies that you are using a less-than-modern printing house. If that is the case, you may be better off using PostScript instead of PDF. Last time I prepared a file for Springer Heidelberg, they explicitly wanted a cmyk pdf file, too. I have no idea what printing house they contacted. I ended up converting those images to appear in color into cmyk jpegs in Photoshop (next time I'm going to try “convert” with “-colorspace cmyk” instead) and the printing house slightly grudingly accepted rgb grey scale images for the bulk of the book. regards, Christopher Creutzig ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Just curious: why do you need a cmyk pdf document? I'm asking because the requirement often implies that you are using a less-than-modern printing house. If that is the case, you may be better off using PostScript instead of PDF. Greetings, Taco Piotr Kopszak wrote: Right, but what exactly happens with included rgb bitmaps when I use: \setupcolors[state=start,cmyk=yes,rgb=no] Will they be left in rgb? ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Piotr Kopszak wrote: On Wed, Dec 01, 2004 at 05:52:09PM +0100, Hans Hagen wrote: Henning Hraban Ramm wrote: Am 01.12.2004 um 15:19 schrieb Piotr Kopszak: Sorry for imprecise question. I meant black generation in rgb images in JPG format included in document. If it's not possible to control the amount of black in that case I'd like to use cmyk JPG images, but will they be left untouched by the colour conversion mechanism? AFAIK ConTeXt doesn't touch pixel images at all - that would be a rather complicated task, perhaps using little_cms or GIMP libraries or the like... indeed, however, you may expect some manipulations without touching the bitmap, like runtime turning gray scales into spot colors and duotones; i have something running here for half a year now but i recently moved the code into the kernel Hans Right, but what exactly happens with included rgb bitmaps when I use: \setupcolors[state=start,cmyk=yes,rgb=no] Will they be left in rgb? bitmaps will not be touched by context, so they will stay rgb (i'm currently cleaning up some figure postprocessign code, so meybe that end up in the distribution) Hans - 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 - ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
On Wed, Dec 01, 2004 at 05:52:09PM +0100, Hans Hagen wrote: > Henning Hraban Ramm wrote: > >Am 01.12.2004 um 15:19 schrieb Piotr Kopszak: > > > >>Sorry for imprecise question. I meant black generation in rgb images > >>in JPG format included in document. If it's not possible to control > >>the amount of black in that case I'd like to use cmyk JPG images, but > >>will they be left untouched by the colour conversion mechanism? > > > > > >AFAIK ConTeXt doesn't touch pixel images at all - that would be a rather > >complicated task, perhaps using little_cms or GIMP libraries or the like... > > indeed, however, you may expect some manipulations without touching the > bitmap, like runtime turning gray scales into spot colors and duotones; i > have something running here for half a year now but i recently moved the > code into the kernel > > Hans Right, but what exactly happens with included rgb bitmaps when I use: \setupcolors[state=start,cmyk=yes,rgb=no] Will they be left in rgb? Piotr -- Piotr Kopszak, Ph.D. Polish Art Gallery, National Museum in Warsaw ->http://kopszak.mnw.art.pl/ http://www.magnatune.com/artists/altri_stromenti ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Henning Hraban Ramm wrote: Am 01.12.2004 um 15:19 schrieb Piotr Kopszak: Sorry for imprecise question. I meant black generation in rgb images in JPG format included in document. If it's not possible to control the amount of black in that case I'd like to use cmyk JPG images, but will they be left untouched by the colour conversion mechanism? AFAIK ConTeXt doesn't touch pixel images at all - that would be a rather complicated task, perhaps using little_cms or GIMP libraries or the like... indeed, however, you may expect some manipulations without touching the bitmap, like runtime turning gray scales into spot colors and duotones; i have something running here for half a year now but i recently moved the code into the kernel Hans - 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 - ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Am 01.12.2004 um 15:19 schrieb Piotr Kopszak: Sorry for imprecise question. I meant black generation in rgb images in JPG format included in document. If it's not possible to control the amount of black in that case I'd like to use cmyk JPG images, but will they be left untouched by the colour conversion mechanism? AFAIK ConTeXt doesn't touch pixel images at all - that would be a rather complicated task, perhaps using little_cms or GIMP libraries or the like... Grüßlis vom Hraban! --- http://www.fiee.net/texnique/ http://contextgarden.net ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
On Tue, Nov 30, 2004 at 04:22:38PM +0100, Taco Hoekwater wrote: > > Hi, > > Piotr Kopszak wrote: > >Hello, > > > >I was wondering if it is possible to influence the level of black > >component generation in cmyk ConTeXt output? > > In the automatic conversion of metapost you mean? Well, you can turn black > generation on (\setupcolors[reduce=no]) or turn it off ([reduce=yes]) ... > > There is no way to control the *amount* of black generation, but you > can of course define your own CMYK colors with an appropriate K component. > > I hope I understood your question correctly. > > Greetings, Taco Sorry for imprecise question. I meant black generation in rgb images in JPG format included in document. If it's not possible to control the amount of black in that case I'd like to use cmyk JPG images, but will they be left untouched by the colour conversion mechanism? Piotr -- Piotr Kopszak, Ph.D. Polish Art Gallery, National Museum in Warsaw ->http://kopszak.mnw.art.pl/ http://www.magnatune.com/artists/altri_stromenti ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Black generation in cmyk output
Hi, Piotr Kopszak wrote: Hello, I was wondering if it is possible to influence the level of black component generation in cmyk ConTeXt output? In the automatic conversion of metapost you mean? Well, you can turn black generation on (\setupcolors[reduce=no]) or turn it off ([reduce=yes]) ... There is no way to control the *amount* of black generation, but you can of course define your own CMYK colors with an appropriate K component. I hope I understood your question correctly. Greetings, Taco ___ ntg-context mailing list [EMAIL PROTECTED] http://www.ntg.nl/mailman/listinfo/ntg-context
