Re: [NTG-context] Black generation in cmyk output

2004-12-07 Thread Tobias Hilbricht
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

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Re: [NTG-context] Black generation in cmyk output

2004-12-07 Thread Siep Kroonenberg
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
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Re: [NTG-context] Black generation in cmyk output

2004-12-03 Thread Christopher Creutzig
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
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Re: [NTG-context] Black generation in cmyk output

2004-12-02 Thread Piotr Kopszak
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

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Re: [NTG-context] Black generation in cmyk output

2004-12-02 Thread Hans Hagen
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
-
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Re: [NTG-context] Black generation in cmyk output

2004-12-02 Thread Taco Hoekwater
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? 
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Re: [NTG-context] Black generation in cmyk output

2004-12-01 Thread Piotr Kopszak
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

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Re: [NTG-context] Black generation in cmyk output

2004-12-01 Thread Henning Hraban Ramm
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
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Re: [NTG-context] Black generation in cmyk output

2004-12-01 Thread Hans Hagen
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
-
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[NTG-context] Black generation in cmyk output

2004-11-30 Thread Piotr Kopszak
Hello, 

I was wondering if it is possible to influence the level of black
component generation in cmyk ConTeXt output? 

Piotr


-- 
   Piotr Kopszak, Ph.D.  
   Polish Art Gallery, National Museum in Warsaw
   -http://kopszak.mnw.art.pl/
   http://www.magnatune.com/artists/altri_stromenti

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Re: [NTG-context] Black generation in cmyk output

2004-11-30 Thread Taco Hoekwater
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


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