[l2h] Image conversion

[Ross Moore]

Hi Bob,

On 28/10/2005, at 10:07 AM, Bob van der Poel wrote:

>
> I think I had and solved this one before ... but I'm no Perl  
> expert ... but, after "upgrading" my linux installation I'm getting  
> a bunch of errors.
>
> When converting images I get:
>
> pstoimg: Error: "/usr/bin/ppmquant -floyd 256 < /var/tmp/l2h31773/ 
> p31811.pnm | /usr/bin/pnmtopng -interlace -trans 'gray85'  >  
> img1.png" failed: Bad file descriptor

Run a job with  -debug .
This will leave all the temporary files in the location where
image processing takes place.
  (e.g., in  /var/tmp/l2h31773  on the run you show here.)

Next,  cd  to that tmp/ subdirectory.

Break up the pipe into single commands:

e.g.
   /usr/bin/ppmquant -floyd 256 < /p31811.pnm  > test.pnm
   /usr/bin/pnmtopng -interlace -trans 'gray85'  < test.pnm  > test.png

Which one fails ?


> Error while converting image
>
> over and over ...
>
> I have checked to make sure I have the prerequisites ... I did not  
> have perldoc (A Mandriva Powerpack 2006 install), but that is there  
> now.
>
> bob$ which perldoc ppmquant pnmtopng
> /usr/bin/perldoc
> /usr/bin/ppmquant
> /usr/bin/pnmtopng
>
>
> Also, I've tried to run as root and get the same errors, so I'm  
> pretty sure it's not a permission error.

I recently debugged a problem with  ppmquant  for Sun Solaris.
(Actually it was  pnmremap  which is called by  ppmquant .)

The problem was solved by recompiling  pnmremap  without optimization.

Perhaps you are having a similar problem under Linux.
Please report back what you find.


> I think there is a problem with pstoimg or some other part of the  
> image conversion chain. Is there a command test I can do to trace  
> it down?

See above.


>
> Thanks.


Hope this helps,

     Ross

>
> -- 
> Bob van der Poel ** Wynndel, British Columbia, CANADA **
> EMAIL: bvdp at uniserve.com
> WWW:   http://mypage.uniserve.com/~bvdp
>
>
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------------------------------------------------------------------------
Ross Moore                                         ross at maths.mq.edu.au
Mathematics Department                             office: E7A-419
Macquarie University                               tel: +61 +2 9850 8955
Sydney, Australia  2109                            fax: +61 +2 9850 8114
------------------------------------------------------------------------