color profiles in PNG and brighter images in PDF

[Georg Datterl]

Hi everybody,

I have a problem when inserting PNG files into a PDF using fop. My PNG file has a color profile "Dot Gain 15%". The PDF contains the same png file, but the color profile is suddenly "KODAK Grayscale Conversion - Gamma 1.0". And, as is clearly visible, the image in the PDF file ist brighter than the PNG. Can anybody on this list enlighten me on why the color profile is changing or how I can prevent it?

The PNG file and PDF file are attached, if you want to recreate the PDF, here's the fo code:

<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
        <fo:layout-master-set>
                <fo:simple-page-master page-height="1cm" page-width="1cm" master-name="main">
                        <fo:region-body/>
                </fo:simple-page-master>
        </fo:layout-master-set>
        <fo:page-sequence master-reference="main">
                <fo:flow flow-name="xsl-region-body">
                        <fo:block>
                                <fo:external-graphic content-width="1cm" content-height="1cm" src="imgTest.png"/>
                        </fo:block>
                </fo:flow>
        </fo:page-sequence>
</fo:root>

Regards,
 
Georg Datterl
 
------ Kontakt ------
 
Georg Datterl
 
Geneon media solutions gmbh
Gutenstetter Straße 8a
90449 Nürnberg
 
HRB Nürnberg: 17193
Geschäftsführer: Yong-Harry Steiert

Tel.: [phone] - 26
Fax: [phone] - 20
 
www.geneon.de
 
Weitere Mitglieder der Willmy MediaGroup:
 
IRS Integrated Realization Services GmbH:    www.irs-nbg.de
Willmy PrintMedia GmbH:                            www.willmy.de
Willmy Consult & Content GmbH:                 www.willmycc.de



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[Jean-François El Fouly]

AFAIK, color profile management is not supported by the current  
version of FOP.
Does your PNG contain transparent parts ?
We had about the same problem, with cockpit screenshots appearing  
"dull" while the original PNG obviously had brighter colors.
It is an extremely complex topic, I spent weeks trying to find a  
solution to such problems and at the end, on a suggestion by Jeremias  
Maerki, we simply removed the transparent parts and that solved our  
problem (but maybe it does not solve yours).
I believe there is only one color profile in the PDFs generated by  
FOP, and IIRC the corresponding FO tags as specified by the standard  
are ignored.

Le 23 juin 09 à 15:50, Georg Datterl a écrit :

> Hi everybody,
>
> I have a problem when inserting PNG files into a PDF using fop. My  
> PNG file has a color profile "Dot Gain 15%". The PDF contains the  
> same png file, but the color profile is suddenly "KODAK Grayscale  
> Conversion - Gamma 1.0". And, as is clearly visible, the image in  
> the PDF file ist brighter than the PNG. Can anybody on this list  
> enlighten me on why the color profile is changing or how I can  
> prevent it?
>
> The PNG file and PDF file are attached, if you want to recreate the  
> PDF, here's the fo code:
>
> <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
> <fo:layout-master-set>
> <fo:simple-page-master page-height="1cm" page-width="1cm" master-
> name="main">
> <fo:region-body/>
> </fo:simple-page-master>
> </fo:layout-master-set>
> <fo:page-sequence master-reference="main">
> <fo:flow flow-name="xsl-region-body">
> <fo:block>
> <fo:external-graphic content-width="1cm" content-height="1cm"  
> src="imgTest.png"/>
> </fo:block>
> </fo:flow>
> </fo:page-sequence>
> </fo:root>
>
> Regards,
>
> Georg Datterl
>
> ------ Kontakt ------
>
> Georg Datterl
>
> Geneon media solutions gmbh
> Gutenstetter Straße 8a
> 90449 Nürnberg
>
> HRB Nürnberg: 17193
> Geschäftsführer: Yong-Harry Steiert
>
> Tel.: [phone] - 26
> Fax: [phone] - 20
>
> www.geneon.de
>
> Weitere Mitglieder der Willmy MediaGroup:
>
> IRS Integrated Realization Services GmbH:    www.irs-nbg.de
> Willmy PrintMedia GmbH:                            www.willmy.de
> Willmy Consult & Content GmbH:                 www.willmycc.de
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: general-unsubscribe@...
> For additional commands, e-mail: general-help@...

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[Georg Datterl]

Hi Jean-François,

Thanks for your answer. No, I don't have transparent parts. And I'm afraid I can't insert transparent parts to darken the images.

Mit freundlichen Grüßen
 
Georg Datterl
 
------ Kontakt ------
 
Georg Datterl
 
Geneon media solutions gmbh
Gutenstetter Straße 8a
90449 Nürnberg
 
HRB Nürnberg: 17193
Geschäftsführer: Yong-Harry Steiert

Tel.: [phone] - 26
Fax: [phone] - 20
 
www.geneon.de
 
Weitere Mitglieder der Willmy MediaGroup:
 
IRS Integrated Realization Services GmbH:    www.irs-nbg.de
Willmy PrintMedia GmbH:                            www.willmy.de
Willmy Consult & Content GmbH:                 www.willmycc.de
-----Ursprüngliche Nachricht-----
Von: Jean-François El Fouly [mailto:jean-francois@...]
Gesendet: Dienstag, 23. Juni 2009 16:04
An: general@...
Betreff: Re: color profiles in PNG and brighter images in PDF

AFAIK, color profile management is not supported by the current version of FOP.
Does your PNG contain transparent parts ?
We had about the same problem, with cockpit screenshots appearing "dull" while the original PNG obviously had brighter colors.
It is an extremely complex topic, I spent weeks trying to find a solution to such problems and at the end, on a suggestion by Jeremias Maerki, we simply removed the transparent parts and that solved our problem (but maybe it does not solve yours).
I believe there is only one color profile in the PDFs generated by FOP, and IIRC the corresponding FO tags as specified by the standard are ignored.

Le 23 juin 09 à 15:50, Georg Datterl a écrit :

> Hi everybody,
>
> I have a problem when inserting PNG files into a PDF using fop. My PNG
> file has a color profile "Dot Gain 15%". The PDF contains the same png
> file, but the color profile is suddenly "KODAK Grayscale Conversion -
> Gamma 1.0". And, as is clearly visible, the image in the PDF file ist
> brighter than the PNG. Can anybody on this list enlighten me on why
> the color profile is changing or how I can prevent it?
>
> The PNG file and PDF file are attached, if you want to recreate the
> PDF, here's the fo code:
>
> <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
> <fo:layout-master-set>
> <fo:simple-page-master page-height="1cm" page-width="1cm" master-
> name="main">
> <fo:region-body/>
> </fo:simple-page-master>
> </fo:layout-master-set>
> <fo:page-sequence master-reference="main">
> <fo:flow flow-name="xsl-region-body">
> <fo:block>
> <fo:external-graphic content-width="1cm" content-height="1cm"  
> src="imgTest.png"/>
> </fo:block>
> </fo:flow>
> </fo:page-sequence>
> </fo:root>
>
> Regards,
>
> Georg Datterl
>
> ------ Kontakt ------
>
> Georg Datterl
>
> Geneon media solutions gmbh
> Gutenstetter Straße 8a
> 90449 Nürnberg
>
> HRB Nürnberg: 17193
> Geschäftsführer: Yong-Harry Steiert
>
> Tel.: [phone] - 26
> Fax: [phone] - 20
>
> www.geneon.de
>
> Weitere Mitglieder der Willmy MediaGroup:
>
> IRS Integrated Realization Services GmbH:    www.irs-nbg.de
> Willmy PrintMedia GmbH:                            www.willmy.de
> Willmy Consult & Content GmbH:                 www.willmycc.de
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: general-unsubscribe@...
> For additional commands, e-mail: general-help@...

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[Jean-François El Fouly]

Le 24 juin 09 à 12:29, Georg Datterl a écrit :

> Hi Jean-François,
>
> Thanks for your answer. No, I don't have transparent parts. And I'm  
> afraid I can't insert transparent parts to darken the images.
>

Maybe my point was not clear but that is probably good news.
Having to manage transparent parts + color profiles would - I guess -  
make your problem even more tricky to solve.
In fact we had to change transparent parts to background color (white)  
to solve our problem.
And BTW having transparent parts does not make the image darker but  
duller (more flat, less bright, it's hard to describe).
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