[l2h] Image conversion
Bob van der Poel
bvdp at uniserve.com
Sat Oct 29 04:13:55 CEST 2005
Thanks for the pointers, Ross. I finally got it somewhat figured out :)
The program pnmtopng from netpbn.10.29 was dumping core. I have no idea
why, but I grabbed 10.30, compiled and installed and all is now well.
Ross Moore wrote:
> 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
> ------------------------------------------------------------------------
>
>
>
--
Bob van der Poel ** Wynndel, British Columbia, CANADA **
EMAIL: bvdp at uniserve.com
WWW: http://mypage.uniserve.com/~bvdp
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