Re: [NTG-context] Colormanagement
On 11/10/2018 2:34 PM, Jan U. Hasecke wrote: Am 09.11.18 um 17:20 schrieb luigi scarso: I think you should use the best colorspace (rgb ) and let the print shop do its job -- of course this means that you have signed their sample (hard proof) of your project. I really tend to do this. I am currently exploring the color management system of ConTeXt together with a friend you is working as a color manager in print industry. And my first try was a failure. The cmyk values in the resulting pdf file (with color profile) differs from the values we calculated (using the same color profile in Gimp). But we have to investigate a bit further, so don't panic. Maybe I the fault was mine. Is there a test case tex file we could use to test the color management? there is no real 1-1 translation from rgb-cmyk .. in many programs that do that there is some additional magic (i remember that photoshop also applied the paper properties and that there was no roundtrip) this is where color profiles come in even viewers (like acrobat) can apply some magic so that the colors come out different from what you expect try this on screen and in print: \startMPpage path p ; p := fullcircle scaled 1cm ; fill p shifted (0cm,1cm) withcolor (1,1,0) ; fill p shifted (1cm,1cm) withcolor (0,0,1,0) ; fill p shifted (0cm,0cm) withcolor (1/2,1/2,0) ; fill p shifted (1cm,0cm) withcolor (0,0,1/2,0) ; \stopMPpage Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl - ___ 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: [NTG-context] Colormanagement
Am 09.11.18 um 17:20 schrieb luigi scarso: > I think you should use the best colorspace (rgb ) > and let the print shop do its job -- of course this means that you have > signed their sample (hard proof) of your project. > I really tend to do this. I am currently exploring the color management system of ConTeXt together with a friend you is working as a color manager in print industry. And my first try was a failure. The cmyk values in the resulting pdf file (with color profile) differs from the values we calculated (using the same color profile in Gimp). But we have to investigate a bit further, so don't panic. Maybe I the fault was mine. Is there a test case tex file we could use to test the color management? juh ___ 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: [NTG-context] Colormanagement
Am 09.11.18 um 17:18 schrieb Tomas Hala: > Hi, > > by default, really not. > > At http://wiki.inkscape.org/wiki/index.php/Color_management > and http://wiki.inkscape.org/wiki/index.php/ExportPDFCMYK > there some instructions how to convert files to CMYK, > or how to install some extension, respectively. > But I have not test these ways yet. > These Python scripts does not work here. :-( But I could ask my designer to convert the RGB-SVG into CMYK-PDF. juh ___ 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: [NTG-context] Colormanagement
On Fri, Nov 9, 2018 at 4:24 PM Jan U. Hasecke
wrote:
> Hi all,
>
> I defined some colors with \definecolor like this:
>
> \definecolor [myblue] [r=0.000, g=0.314, b=0.580, c=0.98, m=0.67,
> y=0.03, k=0.12]
>
> \startnotmode[print]
> \setupcolors[cmyk=no,rgb=yes]
> \stopnotmode
>
> \startmode[print]
> \setupcolors[cmyk=yes,rgb=no]
> \setupbackend[
> format=PDF/X-3:2003,
>intent={ISO Coated v2 300\letterpercent\space (ECI)},
>]
> \stopmode
>
> When I use "context" or "context --mode=print" everything works as
> expected.
>
> But! I have SVG icons I want to use in the document. They contain the
> above defined rgb colors.
>
> When I use --mode=print I get different colors for the SVG icons.
>
> So context converts the SVG files to PDFs but does not change the colors
> accordingly to CMYK.
>
> What are my options? Do I miss something?
>
> 1. Let the designer produce icons in pdf with the given cmyk colors.
>
> 2. Don't use cmyk colors at all.
>
> In fact on my home printer the printed rgb colors look brighter than the
> cmyk colors. This might change in the print shop when they print with
> the right color profile, but it makes me nervous.
>
I think you should use the best colorspace (rgb )
and let the print shop do its job -- of course this means that you have
signed their sample (hard proof) of your project.
Hraban ?
--
luigi
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Re: [NTG-context] Colormanagement
Hi, by default, really not. At http://wiki.inkscape.org/wiki/index.php/Color_management and http://wiki.inkscape.org/wiki/index.php/ExportPDFCMYK there some instructions how to convert files to CMYK, or how to install some extension, respectively. But I have not test these ways yet. Best wishes, Tomáš Fri, Nov 09, 2018 ve 05:03:43PM +0100 Hans Hagen napsal(a): # On 11/9/2018 4:24 PM, Jan U. Hasecke wrote: # # >So context converts the SVG files to PDFs but does not change the colors # >accordingly to CMYK. # i don't know if inkscape has a switch for conversion # # Hans # # - # Hans Hagen | PRAGMA ADE # Ridderstraat 27 | 8061 GH Hasselt | The Netherlands #tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl # - # ___ # 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 # ___ Tomáš Hála Mendelova univerzita, Provozně ekonomická fakulta, ústav informatiky Zemědělská 1, CZ-613 00 Brno, tel. +420 545 13 22 28 http://akela.mendelu.cz/~thala ___ 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: [NTG-context] Colormanagement
On 11/9/2018 4:24 PM, Jan U. Hasecke wrote: So context converts the SVG files to PDFs but does not change the colors accordingly to CMYK. i don't know if inkscape has a switch for conversion Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl - ___ 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 ___
[NTG-context] Colormanagement
Hi all,
I defined some colors with \definecolor like this:
\definecolor [myblue] [r=0.000, g=0.314, b=0.580, c=0.98, m=0.67,
y=0.03, k=0.12]
\startnotmode[print]
\setupcolors[cmyk=no,rgb=yes]
\stopnotmode
\startmode[print]
\setupcolors[cmyk=yes,rgb=no]
\setupbackend[
format=PDF/X-3:2003,
intent={ISO Coated v2 300\letterpercent\space (ECI)},
]
\stopmode
When I use "context" or "context --mode=print" everything works as expected.
But! I have SVG icons I want to use in the document. They contain the
above defined rgb colors.
When I use --mode=print I get different colors for the SVG icons.
So context converts the SVG files to PDFs but does not change the colors
accordingly to CMYK.
What are my options? Do I miss something?
1. Let the designer produce icons in pdf with the given cmyk colors.
2. Don't use cmyk colors at all.
In fact on my home printer the printed rgb colors look brighter than the
cmyk colors. This might change in the print shop when they print with
the right color profile, but it makes me nervous.
juh
___
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
___
