ImageMagick probz in PHP

[Roger Godefroy]

Hi there,

Just a little problem I guess... I have stripped out just an imageresize
string for ImageMagic in a php-file:

<?
exec('convert -quality 100 -antialias -sample 100x100
/var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');
?>

The string would work in a shell, but not using the above php-file. Any
idea's?

Greetz,

Roger

[uws]

Re: ImageMagick probz in PHP

I <bfohnt$fgp$1@n ews3.tilbu1.nb. home.nl>, Roger Godefroy skrev:[color=blue]
> Just a little problem I guess... I have stripped out just an imageresize
> string for ImageMagic in a php-file:
><?
> exec('convert -quality 100 -antialias -sample 100x100
> /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');
> ?>
> The string would work in a shell, but not using the above php-file. Any
> idea's?[/color]

Do you have write permission in the given directory?

mvrgr, Wouter

--
:wq mail uws@xs4all.nl

don't just call me pessimist :: try and read between the lines -- tool

[Roger Godefroy]

Re: ImageMagick probz in PHP

CHMODded the folder and files allready to 777. But no result... Any other
ideas? On another server it works however perfectly using the script
(without resize):

<?php
exec("convert -quality 100 aftermath2.jpg thumb_aftermath .jpg");
?>

But on this new server it won't ??? Strange isn't it?

"uws" <uws@xs4all.inv alid> schreef in bericht
news:your-advertisement-here-call-20030724122237@ klikmans.nl...[color=blue]
> I <bfohnt$fgp$1@n ews3.tilbu1.nb. home.nl>, Roger Godefroy skrev:[color=green]
> > Just a little problem I guess... I have stripped out just an imageresize
> > string for ImageMagic in a php-file:
> ><?
> > exec('convert -quality 100 -antialias -sample 100x100
> > /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');
> > ?>
> > The string would work in a shell, but not using the above php-file. Any
> > idea's?[/color]
>
> Do you have write permission in the given directory?
>
> mvrgr, Wouter
>
> --
> :wq mail[/color]
uws@xs4all.nl[color=blue]
>
> don't just call me pessimist :: try and read between the lines --[/color]
tool

[Shawn Wilson]

Re: ImageMagick probz in PHP


Roger Godefroy wrote:
[color=blue]
> Just a little problem I guess... I have stripped out just an imageresize
> string for ImageMagic in a php-file:
>
> <?
> exec('convert -quality 100 -antialias -sample 100x100
> /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');
> ?>
>
> The string would work in a shell, but not using the above php-file. Any
> idea's?[/color]

When you tried it in the shell, did you use the exact same file in the exact
same directory?
Do you get any error messages (use -debug and -log)? Just some
guesses/suggestions:

Are you 100% certain the path is correct (did you blindly copy path from old
server)?
Is the original file at least 100x100?
Try 'convert /var/www/html/aftermath2.jpg
/var/www/html/thumb_aftermath .jpg'. That'll at least confirm it's not the
sample, quality or antialias.
Make sure /var/www/html/thumb_aftermath .jpg doesn't exist (could have
trouble replacing).
If you have SSH or Telnet access to the server, try just running the
command.
Try with a different image type. I had a helluva time with PNGs - IM was
configured wrong.

Shawn
--
Shawn Wilson
shawn@glassgian t.com

http://www.glassgiant.com

[Roger Godefroy]

Re: ImageMagick probz in PHP

> > Just a little problem I guess... I have stripped out just an
[color=blue][color=green]
> > imageresize string for ImageMagic in a php-file:[/color][/color]
[color=blue][color=green]
> >[/color][/color]
[color=blue][color=green]
> > <?[/color][/color]
[color=blue][color=green]
> > exec('convert -quality 100 -antialias -sample 100x100[/color][/color]
[color=blue][color=green]
> > /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');[/color][/color]
[color=blue][color=green]
> > ?>[/color][/color]
[color=blue][color=green]
> >[/color][/color]
[color=blue][color=green]
> > The string would work in a shell, but not using the above php-file.[/color][/color]
[color=blue][color=green]
> > Any idea's?[/color][/color]
[color=blue]
>[/color]
[color=blue]
> When you tried it in the shell, did you use the exact same file in the[/color]
[color=blue]
> exact same directory?[/color]

Yupz... in the same folder as the php-script and jpg-file using the exact
string as in the php-file.
[color=blue]
> Do you get any error messages (use -debug and -log)? Just some[/color]
[color=blue]
> guesses/suggestions:[/color]
[color=blue]
>[/color]
[color=blue]
> Are you 100% certain the path is correct (did you blindly copy path[/color]
[color=blue]
> from old server)?[/color]

Also without the path it would work on the "old" server. On the new server,
it wouldn't work with the full path /var/www/html or just the filename.
[color=blue]
> Is the original file at least 100x100?[/color]

Original file is 1600x1200
[color=blue]
> Try 'convert /var/www/html/aftermath2.jpg[/color]
[color=blue]
> /var/www/html/thumb_aftermath .jpg'. That'll at least confirm it's not[/color]
[color=blue]
> the sample, quality or antialias.[/color]

Also no output. However executing in a shell, it would...
[color=blue]
> Make sure /var/www/html/thumb_aftermath .jpg doesn't exist (could have[/color]
[color=blue]
> trouble replacing).[/color]

File not existing...
[color=blue]
> If you have SSH or Telnet access to the server, try just running the[/color]
[color=blue]
> command. Try with a different image type. I had a helluva time with[/color]
[color=blue]
> PNGs - IM was configured wrong.[/color]

Also when testing with a .gif, no result... :(

Any other ideas?

Greetings,

Roger Godefroy

[Shawn Wilson]

Re: ImageMagick probz in PHP



Roger Godefroy wrote:
[color=blue][color=green][color=darkred]
> > > Just a little problem I guess... I have stripped out just an[/color][/color]
>[color=green][color=darkred]
> > > imageresize string for ImageMagic in a php-file:[/color][/color]
>[color=green][color=darkred]
> > >[/color][/color]
>[color=green][color=darkred]
> > > <?[/color][/color]
>[color=green][color=darkred]
> > > exec('convert -quality 100 -antialias -sample 100x100[/color][/color]
>[color=green][color=darkred]
> > > /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');[/color][/color]
>[color=green][color=darkred]
> > > ?>[/color][/color]
>[color=green][color=darkred]
> > >[/color][/color]
>[color=green][color=darkred]
> > > The string would work in a shell, but not using the above php-file.[/color][/color]
>[color=green][color=darkred]
> > > Any idea's?[/color][/color]
>[color=green]
> >[/color]
>[color=green]
> > When you tried it in the shell, did you use the exact same file in the[/color]
>[color=green]
> > exact same directory?[/color]
>
> Yupz... in the same folder as the php-script and jpg-file using the exact
> string as in the php-file.
>[color=green]
> > Do you get any error messages (use -debug and -log)? Just some[/color]
>[color=green]
> > guesses/suggestions:[/color]
>[color=green]
> >[/color]
>[color=green]
> > Are you 100% certain the path is correct (did you blindly copy path[/color]
>[color=green]
> > from old server)?[/color]
>
> Also without the path it would work on the "old" server. On the new server,
> it wouldn't work with the full path /var/www/html or just the filename.
>[color=green]
> > Is the original file at least 100x100?[/color]
>
> Original file is 1600x1200
>[color=green]
> > Try 'convert /var/www/html/aftermath2.jpg[/color]
>[color=green]
> > /var/www/html/thumb_aftermath .jpg'. That'll at least confirm it's not[/color]
>[color=green]
> > the sample, quality or antialias.[/color]
>
> Also no output. However executing in a shell, it would...
>[color=green]
> > Make sure /var/www/html/thumb_aftermath .jpg doesn't exist (could have[/color]
>[color=green]
> > trouble replacing).[/color]
>
> File not existing...
>[color=green]
> > If you have SSH or Telnet access to the server, try just running the[/color]
>[color=green]
> > command. Try with a different image type. I had a helluva time with[/color]
>[color=green]
> > PNGs - IM was configured wrong.[/color]
>
> Also when testing with a .gif, no result... :([/color]

Hmmm...

Did you try the log?

Maybe try something simple, like
passthru("ls -l /var/www/html/");

If you get a list of stuff in that directory, try passthru with your convert
command...

Maybe this is on the right track:
From PHP.net (exec function)
Note that when in 'Safe Mode' you must have the script or program you are
trying to execute in the 'safe_mode_exec _dir'. You can find out what this
directory is by using phpinfo().

HTH,
Shawn

--
Shawn Wilson
shawn@glassgian t.com

http://www.glassgiant.com

[Roger Godefroy]

Re: ImageMagick probz in PHP

Hi,



I got a result using the ls-command. But not using the convert-command. The
server isn't in safe mode (checked using phpinfo()). I just got the server
error-log:



----[ SNAP ]----

[2003-07-24 15:56:12]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 15:56:28]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 15:59:59]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 16:00:16]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 16:02:48]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 16:06:06]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 16:06:12]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

[2003-07-24 16:10:22]: info: (real/target/actual) uid: (admin7/admin/admin)
gid:

(admin7/admin/admin) cmd: php-script alt_doc_root:
/home/virtual/site7/fst/var/

www chroot: 1

----[/SNAP]----



Any idea?


Greetings,



Roger



"Shawn Wilson" <shawn@glassgia nt.com> schreef in bericht
news:3F1FEE12.A 65AF22F@glassgi ant.com...[color=blue]
>
>
> Roger Godefroy wrote:
>[color=green][color=darkred]
> > > > Just a little problem I guess... I have stripped out just an[/color]
> >[color=darkred]
> > > > imageresize string for ImageMagic in a php-file:[/color]
> >[color=darkred]
> > > >[/color]
> >[color=darkred]
> > > > <?[/color]
> >[color=darkred]
> > > > exec('convert -quality 100 -antialias -sample 100x100[/color]
> >[color=darkred]
> > > > /var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');[/color]
> >[color=darkred]
> > > > ?>[/color]
> >[color=darkred]
> > > >[/color]
> >[color=darkred]
> > > > The string would work in a shell, but not using the above php-file.[/color]
> >[color=darkred]
> > > > Any idea's?[/color]
> >[color=darkred]
> > >[/color]
> >[color=darkred]
> > > When you tried it in the shell, did you use the exact same file in the[/color]
> >[color=darkred]
> > > exact same directory?[/color]
> >
> > Yupz... in the same folder as the php-script and jpg-file using the[/color][/color]
exact[color=blue][color=green]
> > string as in the php-file.
> >[color=darkred]
> > > Do you get any error messages (use -debug and -log)? Just some[/color]
> >[color=darkred]
> > > guesses/suggestions:[/color]
> >[color=darkred]
> > >[/color]
> >[color=darkred]
> > > Are you 100% certain the path is correct (did you blindly copy path[/color]
> >[color=darkred]
> > > from old server)?[/color]
> >
> > Also without the path it would work on the "old" server. On the new[/color][/color]
server,[color=blue][color=green]
> > it wouldn't work with the full path /var/www/html or just the filename.
> >[color=darkred]
> > > Is the original file at least 100x100?[/color]
> >
> > Original file is 1600x1200
> >[color=darkred]
> > > Try 'convert /var/www/html/aftermath2.jpg[/color]
> >[color=darkred]
> > > /var/www/html/thumb_aftermath .jpg'. That'll at least confirm it's not[/color]
> >[color=darkred]
> > > the sample, quality or antialias.[/color]
> >
> > Also no output. However executing in a shell, it would...
> >[color=darkred]
> > > Make sure /var/www/html/thumb_aftermath .jpg doesn't exist (could have[/color]
> >[color=darkred]
> > > trouble replacing).[/color]
> >
> > File not existing...
> >[color=darkred]
> > > If you have SSH or Telnet access to the server, try just running the[/color]
> >[color=darkred]
> > > command. Try with a different image type. I had a helluva time with[/color]
> >[color=darkred]
> > > PNGs - IM was configured wrong.[/color]
> >
> > Also when testing with a .gif, no result... :([/color]
>
> Hmmm...
>
> Did you try the log?
>
> Maybe try something simple, like
> passthru("ls -l /var/www/html/");
>
> If you get a list of stuff in that directory, try passthru with your[/color]
convert[color=blue]
> command...
>
> Maybe this is on the right track:
> From PHP.net (exec function)
> Note that when in 'Safe Mode' you must have the script or program you are
> trying to execute in the 'safe_mode_exec _dir'. You can find out what this
> directory is by using phpinfo().
>
> HTH,
> Shawn
>
> --
> Shawn Wilson
> shawn@glassgian t.com
> http://www.glassgiant.com
>
>[/color]

[Roger Godefroy]

Re: ImageMagick probz in PHP

I would get an error on the header() row (Internal Server Error 500).

The paths are also without result...

Maybe a server-error?

Greetz...
"Shawn Wilson" <shawn@glassgia nt.com> schreef in bericht
news:3F1FF8A2.D B1C5FE8@glassgi ant.com...[color=blue]
> Roger Godefroy wrote:
>[color=green]
> > Hi,
> >
> > I got a result using the ls-command. But not using the convert-command.[/color][/color]
The[color=blue][color=green]
> > server isn't in safe mode (checked using phpinfo()). I just got the[/color][/color]
server[color=blue][color=green]
> > error-log:
> >
> > ----[ SNAP ]----
> >
> > [2003-07-24 15:56:12]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 15:56:28]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 15:59:59]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 16:00:16]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 16:02:48]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 16:06:06]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 16:06:12]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > [2003-07-24 16:10:22]: info: (real/target/actual) uid:[/color][/color]
(admin7/admin/admin)[color=blue][color=green]
> > gid:
> >
> > (admin7/admin/admin) cmd: php-script alt_doc_root:
> > /home/virtual/site7/fst/var/
> >
> > www chroot: 1
> >
> > ----[/SNAP]----
> >
> > Any idea?
> >
> > Greetings,
> >
> > Roger
> >
> > "Shawn Wilson" <shawn@glassgia nt.com> schreef in bericht
> > news:3F1FEE12.A 65AF22F@glassgi ant.com...[color=darkred]
> > >
> > >
> > > Roger Godefroy wrote:
> > >
> > > > > > Just a little problem I guess... I have stripped out just an
> > > >
> > > > > > imageresize string for ImageMagic in a php-file:
> > > >
> > > > > >
> > > >
> > > > > > <?
> > > >
> > > > > > exec('convert -quality 100 -antialias -sample 100x100
> > > >
> > > > > > /var/www/html/aftermath2.jpg[/color][/color][/color]
/var/www/html/thumb_aftermath .jpg');[color=blue][color=green][color=darkred]
> > > >
> > > > > > ?>
> > > >
> > > > > >
> > > >
> > > > > > The string would work in a shell, but not using the above[/color][/color][/color]
php-file.[color=blue][color=green][color=darkred]
> > > >
> > > > > > Any idea's?
> > > >
> > > > >
> > > >
> > > > > When you tried it in the shell, did you use the exact same file in[/color][/color][/color]
the[color=blue][color=green][color=darkred]
> > > >
> > > > > exact same directory?
> > > >
> > > > Yupz... in the same folder as the php-script and jpg-file using the[/color]
> > exact[color=darkred]
> > > > string as in the php-file.
> > > >
> > > > > Do you get any error messages (use -debug and -log)? Just some
> > > >
> > > > > guesses/suggestions:
> > > >
> > > > >
> > > >
> > > > > Are you 100% certain the path is correct (did you blindly copy[/color][/color][/color]
path[color=blue][color=green][color=darkred]
> > > >
> > > > > from old server)?
> > > >
> > > > Also without the path it would work on the "old" server. On the new[/color]
> > server,[color=darkred]
> > > > it wouldn't work with the full path /var/www/html or just the[/color][/color][/color]
filename.[color=blue][color=green][color=darkred]
> > > >
> > > > > Is the original file at least 100x100?
> > > >
> > > > Original file is 1600x1200
> > > >
> > > > > Try 'convert /var/www/html/aftermath2.jpg
> > > >
> > > > > /var/www/html/thumb_aftermath .jpg'. That'll at least confirm it's[/color][/color][/color]
not[color=blue][color=green][color=darkred]
> > > >
> > > > > the sample, quality or antialias.
> > > >
> > > > Also no output. However executing in a shell, it would...
> > > >
> > > > > Make sure /var/www/html/thumb_aftermath .jpg doesn't exist (could[/color][/color][/color]
have[color=blue][color=green][color=darkred]
> > > >
> > > > > trouble replacing).
> > > >
> > > > File not existing...
> > > >
> > > > > If you have SSH or Telnet access to the server, try just running[/color][/color][/color]
the[color=blue][color=green][color=darkred]
> > > >
> > > > > command. Try with a different image type. I had a helluva time[/color][/color][/color]
with[color=blue][color=green][color=darkred]
> > > >
> > > > > PNGs - IM was configured wrong.
> > > >
> > > > Also when testing with a .gif, no result... :(
> > >
> > > Hmmm...
> > >
> > > Did you try the log?
> > >
> > > Maybe try something simple, like
> > > passthru("ls -l /var/www/html/");
> > >
> > > If you get a list of stuff in that directory, try passthru with your[/color]
> > convert[color=darkred]
> > > command...
> > >
> > > Maybe this is on the right track:
> > > From PHP.net (exec function)
> > > Note that when in 'Safe Mode' you must have the script or program you[/color][/color][/color]
are[color=blue][color=green][color=darkred]
> > > trying to execute in the 'safe_mode_exec _dir'. You can find out what[/color][/color][/color]
this[color=blue][color=green][color=darkred]
> > > directory is by using phpinfo().[/color][/color]
>
> This is a tough one.
>
> Maybe try
> /home/virtual/site7/fst/var/www/html/aftermath2.jpg
> /home/virtual/site7/fst/var/www/html/thumb_aftermath .jpg
> as your paths.
>
> Or try this and only this in a file (make sure there's no spaces or enters
> before or after the <?PHP and ?>!!!):
>
> <?PHP
> header("image/jpg");
> $cmd = "convert xc:#000000 -resize '500x150!' -gravity 'Center' -pointsize[/color]
'64'[color=blue]
> -fill '#000099' -draw 'text -4,-16 \"Hello World\"' jpg:-";
> passthru($cmd);
> ?>
>
> Or it might be header("image/jpeg"); I'm not sure if it matters... You[/color]
should[color=blue]
> get a JPG on your browser. If this works, it'll tell you that the problem[/color]
is[color=blue]
> likely with your image paths...
>
> Shawn
> --
> Shawn Wilson
> shawn@glassgian t.com
> http://www.glassgiant.com
>
>[/color]

[Roger Godefroy]

Re: ImageMagick probz in PHP

> > > This is a tough one.[color=blue][color=green][color=darkred]
> > >
> > > Maybe try
> > > /home/virtual/site7/fst/var/www/html/aftermath2.jpg
> > > /home/virtual/site7/fst/var/www/html/thumb_aftermath .jpg
> > > as your paths.
> > >
> > > Or try this and only this in a file (make sure there's no spaces or[/color][/color][/color]
enters[color=blue][color=green][color=darkred]
> > > before or after the <?PHP and ?>!!!):
> > >
> > > <?PHP
> > > header("image/jpg");
> > > $cmd = "convert xc:#000000 -resize '500x150!' -gravity[/color][/color][/color]
'Center' -pointsize[color=blue][color=green]
> > '64'[color=darkred]
> > > -fill '#000099' -draw 'text -4,-16 \"Hello World\"' jpg:-";
> > > passthru($cmd);
> > > ?>
> > >
> > > Or it might be header("image/jpeg"); I'm not sure if it matters...[/color][/color][/color]
You[color=blue][color=green]
> > should[color=darkred]
> > > get a JPG on your browser. If this works, it'll tell you that the[/color][/color][/color]
problem[color=blue][color=green]
> > is[color=darkred]
> > > likely with your image paths...
> > >[/color][/color]
>
> I'm an idiot. The header line should be:
>
> header("Content-type: image/jpg");
> or
> header("Content-type: image/jpeg");
>
> My apologies...[/color]

The headers works fine now, however with a standard not-found-image (red
cross) on the screen. So again no result :(

[Andy Hassall]

Re: ImageMagick probz in PHP

On Thu, 24 Jul 2003 13:59:59 +0200, "Roger Godefroy" <godefroy@(no
spam)home.nl> wrote:
[color=blue]
>Just a little problem I guess... I have stripped out just an imageresize
>string for ImageMagic in a php-file:
>
><?
>exec('conver t -quality 100 -antialias -sample 100x100
>/var/www/html/aftermath2.jpg /var/www/html/thumb_aftermath .jpg');
>?>[/color]

http://uk.php.net/manual/en/function.exec.php

exec has the facility to give you the return code back; use it and post the
value, it may give a clue.
[color=blue]
>The string would work in a shell, but not using the above php-file. Any
>idea's?[/color]

Your webserver runs in potentially entirely different environment from your
shell.

Is convert on your webserver's PATH? If not, use a full path to convert (do
this anyway).

Does the webserver user have permissions to read and write the files?

Does the webserver user have permissions to execute convert?

--
Andy Hassall (andy@andyh.co. uk) icq(5747695) (http://www.andyh.co.uk)
Space: disk usage analysis tool (http://www.andyhsoftware.co.uk/space)