unwanted rgb-->gray conversion (mkiv)

unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

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Hi Hans,

The attached example works fine with mkii (text and gfx both use RGB 
colors). Using mkiv reduces the colorspace of the graphic to GRAY.
Sadly PDFX/-4 doesn't allow to mix color profiles of colorspace RGB with 
GRAY ones. So I'm forced to always use the RGB colorspace...

Best wishes, Peter

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\setupcolors[state=start]


\definecolor[rgbgray] [r=.5,g=.5,b=.5]

\startuniqueMPgraphic{foo}{size}
    fill unitsquare xyscaled(\MPvar{size},\MPvar{size}) withcolor \MPcolor{rgbgray};
\stopuniqueMPgraphic

\starttext

\uniqueMPgraphic{foo}{size=5cm}
\color[rgbgray] Gray text.

\stoptext


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Re: unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

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Peter Rolf schrieb:
> Hi Hans,
>
> The attached example works fine with mkii (text and gfx both use RGB 
> colors). Using mkiv reduces the colorspace of the graphic to GRAY.
> Sadly PDFX/-4 doesn't allow to mix color profiles of colorspace RGB 
> with GRAY ones. So I'm forced to always use the RGB colorspace...
>
> Best wishes, Peter
> ------------------------------------------------------------------------
>
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
mh, the problem is a little more complex. Mkii reduces rgb(0,0,0) text 
into gray(0), in mkiv color is as expected.
Updated the example...

[-- Attachment #2: reduction.tex --]
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\setupcolors[state=start]

% all colors are in RGB color space (and should stay there)
\definecolor[rgbgray] [r=.5,g=.5,b=.5]
\definecolor[rgbblack] [r=0,g=0,b=0]
\definecolor[rgbwhite] [r=1,g=1,b=1]

\startuniqueMPgraphic{foo}{size,color}
    fill unitsquare xyscaled(\MPvar{size},\MPvar{size}) withcolor \MPvar{color};
    draw boundingbox currentpicture withcolor \MPcolor{rgbblack};
\stopuniqueMPgraphic

\starttext

\uniqueMPgraphic{foo}{size=2.5cm,color=rgbgray} % unwanted gray conversion (mkiv)
\uniqueMPgraphic{foo}{size=2.5cm,color=rgbblack} % unwanted gray conversion (mkiv)
\uniqueMPgraphic{foo}{size=2.5cm,color=rgbwhite} % unwanted gray conversion (mkiv)
\color[rgbgray] Gray text. % ok
\blank
\color[rgbblack] Black text. % unwanted gray conversion (mkii)
\blank
\framed[background=color,backgroundcolor=rgbblack,foregroundcolor=rgbwhite]
{White text} % unwanted gray conversion of background color (mkii)

\stoptext


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Re: unwanted rgb-->gray conversion (mkiv)

[Wolfgang Schuster]

Am 02.02.2009 um 14:38 schrieb Peter Rolf:

> mh, the problem is a little more complex. Mkii reduces rgb(0,0,0)  
> text into gray(0), in mkiv color is as expected.
> Updated the example...
> \setupcolors[state=start]

AFAIR \setupcolors[state=start,conversion=no]

Wolfgang

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Re: unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

Wolfgang Schuster schrieb:
>
> Am 02.02.2009 um 14:38 schrieb Peter Rolf:
>
>> mh, the problem is a little more complex. Mkii reduces rgb(0,0,0) 
>> text into gray(0), in mkiv color is as expected.
>> Updated the example...
>> \setupcolors[state=start]
>
> AFAIR \setupcolors[state=start,conversion=no]
>
I get exactly the same unwanted conversions in both marks  (even if I 
use 'conversion=yes').

> Wolfgang
>
> ___________________________________________________________________________________ 
>
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

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___________________________________________________________________________________

Re: unwanted rgb-->gray conversion (mkiv)

[Wolfgang Schuster]

Am 03.02.2009 um 11:46 schrieb Peter Rolf:

> Wolfgang Schuster schrieb:
>>
>> Am 02.02.2009 um 14:38 schrieb Peter Rolf:
>>
>>> mh, the problem is a little more complex. Mkii reduces rgb(0,0,0)  
>>> text into gray(0), in mkiv color is as expected.
>>> Updated the example...
>>> \setupcolors[state=start]
>>
>> AFAIR \setupcolors[state=start,conversion=no]
>
> I get exactly the same unwanted conversions in both marks  (even if  
> I use 'conversion=yes').

The rgb(0,0,0) to gray(0) is hard coded in the \definecolor
command, can you try if this did also happen with nonzero values
for rgb (+conversion=no).

Wolfgang

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Re: unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

Wolfgang Schuster schrieb:
>
> Am 03.02.2009 um 11:46 schrieb Peter Rolf:
>
>> Wolfgang Schuster schrieb:
>>>
>>> Am 02.02.2009 um 14:38 schrieb Peter Rolf:
>>>
>>>> mh, the problem is a little more complex. Mkii reduces rgb(0,0,0) 
>>>> text into gray(0), in mkiv color is as expected.
>>>> Updated the example...
>>>> \setupcolors[state=start]
>>>
>>> AFAIR \setupcolors[state=start,conversion=no]
>>
>> I get exactly the same unwanted conversions in both marks  (even if I 
>> use 'conversion=yes').
>
> The rgb(0,0,0) to gray(0) is hard coded in the \definecolor
> command, can you try if this did also happen with nonzero values
> for rgb (+conversion=no).
>
Thanks Wolfgang. The gray scales white and a 50% gray are already part 
of my example (and they work fine).
Just add '\pdfcompresslevel0' at the top of my example and you can 'see' 
(viewing the pdf in a text editor) the used color space.

0 g 0 G      gray black
0 0 0 rg 0 0 0 RG    rgb black


> Wolfgang
>
> ___________________________________________________________________________________ 
>
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

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___________________________________________________________________________________

Re: unwanted rgb-->gray conversion (mkiv)

[Wolfgang Schuster]

Am 03.02.2009 um 13:12 schrieb Peter Rolf:

> Thanks Wolfgang. The gray scales white and a 50% gray are already  
> part of my example (and they work fine).
> Just add '\pdfcompresslevel0' at the top of my example and you can  
> 'see' (viewing the pdf in a text editor) the used color space.
>
> 0 g 0 G      gray black
> 0 0 0 rg 0 0 0 RG    rgb black

Add \let\colorZpattern\colorRpattern to your file.

Wolfgang

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___________________________________________________________________________________

Re: unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

Wolfgang Schuster schrieb:
>
> Am 03.02.2009 um 13:12 schrieb Peter Rolf:
>
>> Thanks Wolfgang. The gray scales white and a 50% gray are already 
>> part of my example (and they work fine).
>> Just add '\pdfcompresslevel0' at the top of my example and you can 
>> 'see' (viewing the pdf in a text editor) the used color space.
>>
>> 0 g 0 G      gray black
>> 0 0 0 rg 0 0 0 RG    rgb black
>
> Add \let\colorZpattern\colorRpattern to your file.
>
Yep, this (kind of) fixes the unwanted conversion in mkii. The 
conversion of the mp colors in mkiv remains.
Anyhow, this is nothing urgent, but things should be fixed (a conversion 
should be optional).
Thanks again for your effort.

Best wishes,  Peter


> Wolfgang
>
> ___________________________________________________________________________________ 
>
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________ 
>
>

___________________________________________________________________________________
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archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: unwanted rgb-->gray conversion (mkiv)

[Peter Rolf]

Peter Rolf schrieb:
> Hi Hans,
>
> The attached example works fine with mkii (text and gfx both use RGB 
> colors). Using mkiv reduces the colorspace of the graphic to GRAY.
> Sadly PDFX/-4 doesn't allow to mix color profiles of colorspace RGB 
> with GRAY ones. So I'm forced to always use the RGB colorspace...
>
Final note: I must admit, that my conclusion is BS  (also the reason why 
the problem is not urgent any more).

You can't combine RGB and GRAY color profiles as output intents (IO) in 
PDF/X-4. But the usage of different colorspaces in the document (like 
RGB+GRAY) and the IO (like CMYK) is valid. So no need for any color 
conversion. My error in reasoning...

> Best wishes, Peter
> ------------------------------------------------------------------------
>
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________