* 16-bit png
@ 2008-02-14 10:08 Alan BRASLAU
2008-02-15 8:18 ` Aditya Mahajan
2008-02-15 8:23 ` Taco Hoekwater
0 siblings, 2 replies; 10+ messages in thread
From: Alan BRASLAU @ 2008-02-14 10:08 UTC (permalink / raw)
To: ntg-context
Hello,
I am having problems including 16-bit png files in ConTeXt. In the following
example, red.png is a 800x600 image of red pixels. The resulting test.pdf
shows a BLACK rectangle. (The same problem exists with real images.)
However, I can produce the desired result with my installation under
pdflatex...
$ cat test.tex
\starttext
\externalfigure[red][width=\textwidth]
\stoptext
$ file red.png
red.png: PNG image data, 800 x 600, 16-bit/color RGB, non-interlaced
$ texexec test
$ cat test2.tex
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[width=\textwidth]{red}
\end{document}
$ pdflatex test2
My distribution (debian + texlive) uses
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
in both cases.
Does this have something to do with \pdfimagehicolor?
Thank you
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
2008-02-14 10:08 16-bit png Alan BRASLAU
@ 2008-02-15 8:18 ` Aditya Mahajan
2008-02-15 8:43 ` Hans Hagen
2008-02-15 8:23 ` Taco Hoekwater
1 sibling, 1 reply; 10+ messages in thread
From: Aditya Mahajan @ 2008-02-15 8:18 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi
Does adding \setupcolors[state=start] at the top of the context file help?
Hans, how about enabling colors by default in mkiv?
Aditya
On Thu, 14 Feb 2008, Alan BRASLAU wrote:
> Hello,
>
> I am having problems including 16-bit png files in ConTeXt. In the following
> example, red.png is a 800x600 image of red pixels. The resulting test.pdf
> shows a BLACK rectangle. (The same problem exists with real images.)
>
> However, I can produce the desired result with my installation under
> pdflatex...
>
> $ cat test.tex
> \starttext
> \externalfigure[red][width=\textwidth]
> \stoptext
> $ file red.png
> red.png: PNG image data, 800 x 600, 16-bit/color RGB, non-interlaced
> $ texexec test
>
> $ cat test2.tex
> \documentclass{article}
> \usepackage{graphicx}
> \begin{document}
> \includegraphics[width=\textwidth]{red}
> \end{document}
> $ pdflatex test2
>
> My distribution (debian + texlive) uses
> This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
> in both cases.
>
> Does this have something to do with \pdfimagehicolor?
>
> Thank you
> ___________________________________________________________________________________
> 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
> ___________________________________________________________________________________
>
>
>
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
2008-02-14 10:08 16-bit png Alan BRASLAU
2008-02-15 8:18 ` Aditya Mahajan
@ 2008-02-15 8:23 ` Taco Hoekwater
1 sibling, 0 replies; 10+ messages in thread
From: Taco Hoekwater @ 2008-02-15 8:23 UTC (permalink / raw)
To: mailing list for ConTeXt users
Alan BRASLAU wrote:
>
> $ cat test.tex
\starttext
\pdfimagehicolor=1
\externalfigure[red][width=\textwidth]
\stoptext
There, fixed that.
That setting could go into the context core, though.
> Does this have something to do with \pdfimagehicolor?
I am always surprised how many people ask a question,
guess the correct answer themselves, but don't actually
attempt to see if it works :-)
Best wishes,
Taco
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
@ 2008-02-15 8:39 Alan BRASLAU
2008-02-15 8:48 ` Hans Hagen
2008-02-15 8:58 ` Taco Hoekwater
0 siblings, 2 replies; 10+ messages in thread
From: Alan BRASLAU @ 2008-02-15 8:39 UTC (permalink / raw)
To: mailing list for ConTeXt users
[-- Attachment #1: Type: text/plain, Size: 1200 bytes --]
On Friday 15 February 2008 09:23:12 Taco Hoekwater wrote:
> Alan BRASLAU wrote:
> > $ cat test.tex
>
> \starttext
> \pdfimagehicolor=1
> \externalfigure[red][width=\textwidth]
> \stoptext
>
> There, fixed that.
>
> That setting could go into the context core, though.
>
> > Does this have something to do with \pdfimagehicolor?
>
> I am always surprised how many people ask a question,
> guess the correct answer themselves, but don't actually
> attempt to see if it works :-)
>
> Best wishes,
> Taco
Thanks for the very rapid answer.
However, no, neither of the proposed solutions work.
1. Of course, I tried "\pdfimagehicolor=1" without results before posting the
question. (I would NEVER think about asking for help without trying different
possibilities myself...)
2. "\setupcolors[state=start]" was also in my original file, but did not seem
to make a difference, so I posted a most simplified example.
What to do? I would think that there is something wrong with my configuration
(debian/unstable), however pdflatex works just fine.
Alan
(P.S. Why would one need to specify \pdfimagehicolor in any case; From a
user's point of view, shouldn't it just work transparently?)
[-- Attachment #2: Taco Hoekwater <taco@elvenkind.com>: Re: [NTG-context] 16-bit png --]
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From: Taco Hoekwater <taco@elvenkind.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: [NTG-context] 16-bit png
Date: Fri, 15 Feb 2008 09:23:12 +0100
Message-ID: <47B54BF0.8040406@elvenkind.com>
Alan BRASLAU wrote:
>
> $ cat test.tex
\starttext
\pdfimagehicolor=1
\externalfigure[red][width=\textwidth]
\stoptext
There, fixed that.
That setting could go into the context core, though.
> Does this have something to do with \pdfimagehicolor?
I am always surprised how many people ask a question,
guess the correct answer themselves, but don't actually
attempt to see if it works :-)
Best wishes,
Taco
___________________________________________________________________________________
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
___________________________________________________________________________________
[-- Attachment #3: Aditya Mahajan <adityam@umich.edu>: Re: [NTG-context] 16-bit png --]
[-- Type: message/rfc822, Size: 5926 bytes --]
From: Aditya Mahajan <adityam@umich.edu>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: [NTG-context] 16-bit png
Date: Fri, 15 Feb 2008 03:18:34 -0500 (EST)
Message-ID: <alpine.DEB.1.00.0802150315000.32477@nqv-yncgbc>
Hi
Does adding \setupcolors[state=start] at the top of the context file help?
Hans, how about enabling colors by default in mkiv?
Aditya
On Thu, 14 Feb 2008, Alan BRASLAU wrote:
> Hello,
>
> I am having problems including 16-bit png files in ConTeXt. In the following
> example, red.png is a 800x600 image of red pixels. The resulting test.pdf
> shows a BLACK rectangle. (The same problem exists with real images.)
>
> However, I can produce the desired result with my installation under
> pdflatex...
>
> $ cat test.tex
> \starttext
> \externalfigure[red][width=\textwidth]
> \stoptext
> $ file red.png
> red.png: PNG image data, 800 x 600, 16-bit/color RGB, non-interlaced
> $ texexec test
>
> $ cat test2.tex
> \documentclass{article}
> \usepackage{graphicx}
> \begin{document}
> \includegraphics[width=\textwidth]{red}
> \end{document}
> $ pdflatex test2
>
> My distribution (debian + texlive) uses
> This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
> in both cases.
>
> Does this have something to do with \pdfimagehicolor?
>
> Thank you
> ___________________________________________________________________________________
> 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
> ___________________________________________________________________________________
>
>
>
___________________________________________________________________________________
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
___________________________________________________________________________________
[-- Attachment #4: Type: text/plain, Size: 487 bytes --]
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
2008-02-15 8:39 Alan BRASLAU
@ 2008-02-15 8:48 ` Hans Hagen
2008-02-15 8:59 ` Taco Hoekwater
2008-02-15 8:58 ` Taco Hoekwater
1 sibling, 1 reply; 10+ messages in thread
From: Hans Hagen @ 2008-02-15 8:48 UTC (permalink / raw)
To: mailing list for ConTeXt users
can you send taco /me that image?
-----------------------------------------------------------------
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
-----------------------------------------------------------------
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
2008-02-15 8:39 Alan BRASLAU
2008-02-15 8:48 ` Hans Hagen
@ 2008-02-15 8:58 ` Taco Hoekwater
2008-02-15 10:22 ` Taco Hoekwater
1 sibling, 1 reply; 10+ messages in thread
From: Taco Hoekwater @ 2008-02-15 8:58 UTC (permalink / raw)
To: mailing list for ConTeXt users
Alan BRASLAU wrote:
> 1. Of course, I tried "\pdfimagehicolor=1" without results before posting the
> question.
Next time, post also that you tried that already ;-)
> (I would NEVER think about asking for help without trying different
> possibilities myself...)
Are you by chance running an old version of context? That input works
for me, so you can try upgrading the context installation, or
you can see if adding \pdfminorversion=5 to your input file helps.
16-bit color is not supported in older versions of the pdf standard,
and older versions of context had an implicit \pdfminorversion=4.
Best wishes,
Taco
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: 16-bit png
2008-02-15 8:58 ` Taco Hoekwater
@ 2008-02-15 10:22 ` Taco Hoekwater
0 siblings, 0 replies; 10+ messages in thread
From: Taco Hoekwater @ 2008-02-15 10:22 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
We did a bit of offlist emailing and have now fixed this issue.
Because I got confused as well, here is a quick recap with the
correct diagnostics, for future reference:
The context example actually did work as promised: it included
the image in 16-bit color in a PDF 1.5 document.
The context document appeared not to work, because Alan's previewer
(xpdf) does not deal with 16-bit images correctly. The file displayed
fine with acroread or ghostscript.
The latex document appeared to work, but only because it included
a downgraded 8-bit color version of the image.
To get the latex-effect in context, there are two possibilities:
either \pdfminorversion=4 (or lower) or \pdfimagehicolor=0.
To get the context-effect in latex, I have no idea. ?
Best wishes,
Taco
___________________________________________________________________________________
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
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 10+ messages in thread
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Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-02-14 10:08 16-bit png Alan BRASLAU
2008-02-15 8:18 ` Aditya Mahajan
2008-02-15 8:43 ` Hans Hagen
2008-02-15 8:23 ` Taco Hoekwater
2008-02-15 8:39 Alan BRASLAU
2008-02-15 8:48 ` Hans Hagen
2008-02-15 8:59 ` Taco Hoekwater
2008-02-15 8:58 ` Taco Hoekwater
2008-02-15 10:22 ` Taco Hoekwater
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2008-02-15 10:24 ` Alan BRASLAU
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