[Bioperl-l] problems iwth Bio::graphics module

[Marc Logghe]

Hi Li,
Did you check your script for any other print statements (to STDOUT,
that is) that potentially could contaminate your png stream ?

Marc


> -----Original Message-----
> From: bioperl-l-bounces at lists.open-bio.org 
> [mailto:bioperl-l-bounces at lists.open-bio.org] On Behalf Of chen li
> Sent: Tuesday, May 23, 2006 12:58 AM
> To: Torsten Seemann
> Cc: bioperl-l at lists.open-bio.org
> Subject: Re: [Bioperl-l] problems iwth Bio::graphics module
> 
> Hi,
> 
> I try both: either with or without this statement
>  binmode(STDOUT) before the last line print $panel->png; But 
> there are no differenes. I get a file of 2432 bytes.
> 
> Li
> 
> 
> 
> > Chen Li
> > 
> > >  perl render_blast1.pl data1.txt >im.png
> > 
> > Based on http://bioperl.org/wiki/HOWTO:Graphics I believe 
> the example 
> > script is creating a PNG image. The last line is:
> > print $panel->png;
> > 
> > > and Perl runs without any problem. I use adobe photoshop to open 
> > > them and Adobe can't recognize
> > them.
> > > If I use ACDSee to open them I only get a black background. If I 
> > > issue this line under Cygwin X
> > window
> > > display im.png  or display im.gif
> > > Cygwin says:
> > > display: Improper image header `im.png'.
> > > It seems Perl can't produce an image with right format.
> > 
> > Are you sure Perl is producing a PNG file at all?
> > How many bytes does im.png use? Zero?
> > 
> > Did you notice this in
> > http://bioperl.org/wiki/HOWTO:Graphics ?
> > 
> > It says: "If you are on a Windows platform, you need to put STDOUT 
> > into binary mode so that the PNG file does not go through Window's 
> > carriage return/linefeed transformations. Before the final print 
> > statement, put the statement binmode(STDOUT)."
> > 
> > ie. your script should have
> > 
> > binmode(STDOUT);
> > print $panel->png;
> > 
> > as the last 2 lines.
> > 
> > > Do you experience the same problem before?
> > 
> > No.
> > 
> > --Torsten
> > 
> 
> 
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