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convert pdf to png

I need to take the take the pdf output from reportlab and create a preview image
for a web page. so png or something. I am sure ghostscript will be involved.
I am guessing PIL or ImageMagic ?

all sugestions welcome.

Carl K
Dec 24 '07 #1
23 10978
On Dec 24, 2007 7:53 AM, Carl K <ca**@personnelware.comwrote:
I need to take the take the pdf output from reportlab and create a preview image
for a web page. so png or something. I am sure ghostscript will be involved.
I am guessing PIL or ImageMagic ?

all sugestions welcome.

Carl K
--
http://mail.python.org/mailman/listinfo/python-list
PIL's support for pdf files is write only, so thats out of the question.

I just tried ImageMagik from the console and it converted a pdf into
png in a snap, so that seems to be your best bet.

--
nasser
Dec 24 '07 #2
Carl K wrote:
I need to take the take the pdf output from reportlab and create a
preview image for a web page. so png or something. I am sure
ghostscript will be involved. I am guessing PIL or ImageMagic ?

all sugestions welcome.
If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png

Jaap
Dec 24 '07 #3
Jaap Spies wrote:
Carl K wrote:
>I need to take the take the pdf output from reportlab and create a
preview image for a web page. so png or something. I am sure
ghostscript will be involved. I am guessing PIL or ImageMagic ?

all sugestions welcome.

If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a someone else's shared
host web server, security and performance is an issue. So I would rather not
run stuff via popen. I also need something that is easy to install. (either
easy_install or a distro package)

I just looked at what it takes to install PythonMagick:

Requists for installation is:
boost
boost-python
python 2.5
Magick++ (>= 6.2)
and for building:
pkg-config
libtool
make

That is looking like maybe "not easy to install"

so I need to make an easy_install-able .tgz or some other way of making the image.

Carl K
Dec 24 '07 #4
On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png

I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.
Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
I also need something that is easy to install. (either
easy_install or a distro package)
That's a problem.

--
Grant

Dec 24 '07 #5
Grant Edwards wrote:
On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned to the
browser; so it never becomes a file. using convert means I have to first save
it as a file, convert from file to file, read the file, delete the 2 files. so 6
file operations where before there were none. That may be more of a load than
the ghostscript part.

Carl K
Dec 24 '07 #6
Carl K wrote:
Grant Edwards wrote:
>On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>>>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned to
the browser; so it never becomes a file. using convert means I have to
first save it as a file, convert from file to file, read the file,
delete the 2 files. so 6 file operations where before there were none.
That may be more of a load than the ghostscript part.

Carl K
Are you clever and am I stupid? I did not read this in your original post!

Jaap

Dec 25 '07 #7
Grant Edwards wrote:
On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
Using ctypes to call Ghostscript's API also works well. I've only done
this on Windows, but it should also work on other systems with ctypes
support.

--
-------------------------------------------------------------------------
Andrew I MacIntyre "These thoughts are mine alone..."
E-mail: an*****@bullseye.apana.org.au (pref) | Snail: PO Box 370
an*****@pcug.org.au (alt) | Belconnen ACT 2616
Web: http://www.andymac.org/ | Australia
Dec 25 '07 #8
Andrew MacIntyre wrote:
Grant Edwards wrote:
>On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>>>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

Using ctypes to call Ghostscript's API also works well. I've only done
this on Windows, but it should also work on other systems with ctypes
support.
sounds good, but I have 0.0 clue what that actually means.

Can you give me what you did with windows in hopes that I can figure out how to
do it in Linux? I am guessing it shouldn't be to different. (well, hoping...)

Carl K
Dec 25 '07 #9
Jaap Spies wrote:
Carl K wrote:
>Grant Edwards wrote:
>>On 2007-12-24, Carl K <ca**@personnelware.comwrote:

If it is a multi page pdf Imagemagick will do:
>
convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned
to the browser; so it never becomes a file. using convert means I
have to first save it as a file, convert from file to file, read the
file, delete the 2 files. so 6 file operations where before there were
none. That may be more of a load than the ghostscript part.

Carl K

Are you clever and am I stupid? I did not read this in your original post!
Here is what the code looks like that generates the pdf:

buffer = StringIO()
rw = dReportWriter(OutputFile=buffer, ReportFormFile=xmlfile, Cursor=ds)
rw.write()
pdf = buffer.getvalue()
return pdf

Carl K
Dec 25 '07 #10
Carl K schrieb:
Grant Edwards wrote:
>On 2007-12-24, Carl K <ca**@personnelware.comwrote:
>>>If it is a multi page pdf Imagemagick will do:

convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned to
the browser; so it never becomes a file. using convert means I have to
first save it as a file, convert from file to file, read the file,
delete the 2 files. so 6 file operations where before there were none.
That may be more of a load than the ghostscript part.
So what? I'm not sure about current HD speeds, but a couple of years ago
these were about 30MByte/s - and should be faster today. Which equals
240MBit/s, much more than your user's internet connection. and this is
raw IO speed, not counting disk caches.

In other words: given the overall latency of a network connection, your
file operations shouldn't shave off more than a split-second. So if
you _can_ go the subprocess-road, do it. It's the easiest way. And
withou further knowledge of the GS-library (that you lack, as do I) -
how do you know that it works "in memory", and doesn't actually expect a
file-name or pointer?

Diez
Dec 25 '07 #11
Carl K <ca**@personnelware.comwrites:
I need to take the take the pdf output from reportlab and create a
preview image for a web page. so png or something. I am sure
ghostscript will be involved. I am guessing PIL or ImageMagic ?

all sugestions welcome.
Did you try to use `reportPM` from rl_addons [1]_?
This is an extension of the reportlab package.

There is also PIL needed and on my linux box
I needed some additional fonts [2]_.

And then I could create PNG directly from reportlab, e.g:

<code>
from reportlab.graphics.shapes import Drawing, String
from reportlab.graphics import renderPM

d = Drawing(400, 200)
d.add(String(150, 100, 'Hello World', fontSize=18))
renderPM.drawToFile(d, 'test.png', 'PNG')
</code>

... [1] http://www.reportlab.co.uk/svn/publi...unk/rl_addons/
... [2] http://www.reportlab.com/ftp/fonts/pfbfer.zip

HTH,
Rob
Dec 25 '07 #12
Diez B. Roggisch wrote:
Carl K schrieb:
>Grant Edwards wrote:
>>On 2007-12-24, Carl K <ca**@personnelware.comwrote:

If it is a multi page pdf Imagemagick will do:
>
convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned
to the browser; so it never becomes a file. using convert means I
have to first save it as a file, convert from file to file, read the
file, delete the 2 files. so 6 file operations where before there were
none. That may be more of a load than the ghostscript part.

So what? I'm not sure about current HD speeds, but a couple of years ago
these were about 30MByte/s - and should be faster today. Which equals
240MBit/s, much more than your user's internet connection. and this is
raw IO speed, not counting disk caches.
server is doing a ton of SQL queries (yes, moving to a 2nd box would be nice.
might happen mid 2008) so adding HD is an issue. not sure how much, but enough
to try to avoid it.
>
In other words: given the overall latency of a network connection, your
file operations shouldn't shave off more than a split-second.
those split seconds can add up. The server is aleady overloaded, so adding more
is a big no no.
So if you
_can_ go the subprocess-road, do it. It's the easiest way. And withou
further knowledge of the GS-library (that you lack, as do I) - how do
you know that it works "in memory", and doesn't actually expect a
file-name or pointer?
I am willing to take that chance. much better than the 6 hits I know would
happen using

I have a feeling if I have to create a file, we will go with plan B: send the
client a pdf and let the user deal with it. Not as nice and slick, but won't
bog the server.

Carl K
Dec 25 '07 #13
Rob Wolfe wrote:
Carl K <ca**@personnelware.comwrites:
>I need to take the take the pdf output from reportlab and create a
preview image for a web page. so png or something. I am sure
ghostscript will be involved. I am guessing PIL or ImageMagic ?

all sugestions welcome.

Did you try to use `reportPM` from rl_addons [1]_?
This is an extension of the reportlab package.

There is also PIL needed and on my linux box
I needed some additional fonts [2]_.

And then I could create PNG directly from reportlab, e.g:

<code>
from reportlab.graphics.shapes import Drawing, String
from reportlab.graphics import renderPM

d = Drawing(400, 200)
d.add(String(150, 100, 'Hello World', fontSize=18))
renderPM.drawToFile(d, 'test.png', 'PNG')
</code>

.. [1] http://www.reportlab.co.uk/svn/publi...unk/rl_addons/
.. [2] http://www.reportlab.com/ftp/fonts/pfbfer.zip
This sounds like what I was looking for. some how this got missed when I poked
around reportlab land.

Thanks much.

Carl K
Dec 25 '07 #14
On 2007-12-25, Diez B. Roggisch <de***@nospam.web.dewrote:
Carl K schrieb:
>Grant Edwards wrote:
>>On 2007-12-24, Carl K <ca**@personnelware.comwrote:

If it is a multi page pdf Imagemagick will do:
>
convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.

maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned to
the browser; so it never becomes a file. using convert means I have to
first save it as a file, convert from file to file, read the file,
delete the 2 files. so 6 file operations where before there were none.
That may be more of a load than the ghostscript part.

So what? I'm not sure about current HD speeds, but a couple of years ago
these were about 30MByte/s - and should be faster today. Which equals
240MBit/s, much more than your user's internet connection. and this is
raw IO speed, not counting disk caches.
Unless the file is really huge (or the server is overloaded),
the bytes will probably never even hit a platter. If you're
using any even remotely modern OS, short-lived tempfiles used
as you desdcribe are basically just memory-buffers with a
filesystem API.

--
Grant

Dec 25 '07 #15
Carl K wrote:
Andrew MacIntyre wrote:
>Grant Edwards wrote:
>>On 2007-12-24, Carl K <ca**@personnelware.comwrote:

If it is a multi page pdf Imagemagick will do:
>
convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.
Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
Using ctypes to call Ghostscript's API also works well. I've only done
this on Windows, but it should also work on other systems with ctypes
support.

sounds good, but I have 0.0 clue what that actually means.

Can you give me what you did with windows in hopes that I can figure out how to
do it in Linux? I am guessing it shouldn't be to different. (well, hoping...)
ctypes is a foreign function interface (FFI) extension that became part
of the standard library with Python 2.5 (& is available for 2.3 & 2.4).
It is supported on Linux, *BSD & Solaris (I think) in addition to Windows.

Ghostscript for quite some time has had support for being used as a
library (DLL on Windows). There are only a small number of API functions
exported, and there is information about the net for calling these API
functions from Visual Basic. I wrote a wrapper module using ctypes for
the API based on the C header and the VB information.

To get the best rendering, some understanding of Ghostscript options is
required particularly for image format outputs (eg for anti-aliasing text).

--
-------------------------------------------------------------------------
Andrew I MacIntyre "These thoughts are mine alone..."
E-mail: an*****@bullseye.apana.org.au (pref) | Snail: PO Box 370
an*****@pcug.org.au (alt) | Belconnen ACT 2616
Web: http://www.andymac.org/ | Australia
Dec 26 '07 #16
Carl K schrieb:
Diez B. Roggisch wrote:
>Carl K schrieb:
>>Grant Edwards wrote:
On 2007-12-24, Carl K <ca**@personnelware.comwrote:

>If it is a multi page pdf Imagemagick will do:
>>
>convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.

Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned
to the browser; so it never becomes a file. using convert means I
have to first save it as a file, convert from file to file, read the
file, delete the 2 files. so 6 file operations where before there
were none. That may be more of a load than the ghostscript part.

So what? I'm not sure about current HD speeds, but a couple of years
ago these were about 30MByte/s - and should be faster today. Which
equals 240MBit/s, much more than your user's internet connection. and
this is raw IO speed, not counting disk caches.

server is doing a ton of SQL queries (yes, moving to a 2nd box would be
nice. might happen mid 2008) so adding HD is an issue. not sure how
much, but enough to try to avoid it.
Keeping stuff in memory provoking paging isn't?
>>
In other words: given the overall latency of a network connection,
your file operations shouldn't shave off more than a split-second.

those split seconds can add up. The server is aleady overloaded, so
adding more is a big no no.
So if you
_can_ go the subprocess-road, do it. It's the easiest way. And withou
further knowledge of the GS-library (that you lack, as do I) - how do
you know that it works "in memory", and doesn't actually expect a
file-name or pointer?

I am willing to take that chance. much better than the 6 hits I know
would happen using

I have a feeling if I have to create a file, we will go with plan B:
send the client a pdf and let the user deal with it. Not as nice and
slick, but won't bog the server.
I have the feeling you just go by your feelings. Which is always a bad
idea regarding performance bottlenecks.

http://en.wikipedia.org/wiki/Optimiz...mputer_science)

So instead of jumping through hoops getting something done the hard way
without knowing how the easy solution affects performance, implement the
feature the easiest way. And SEE if it causes trouble.

Diez
Dec 26 '07 #17
Carl K wrote:
Rob Wolfe wrote:
>Carl K <ca**@personnelware.comwrites:
>>I need to take the take the pdf output from reportlab and create a
preview image for a web page. so png or something. I am sure
ghostscript will be involved. I am guessing PIL or ImageMagic ?

all sugestions welcome.

Did you try to use `reportPM` from rl_addons [1]_? This is an
extension of the reportlab package.

There is also PIL needed and on my linux box
I needed some additional fonts [2]_.

And then I could create PNG directly from reportlab, e.g:

<code>
from reportlab.graphics.shapes import Drawing, String
from reportlab.graphics import renderPM

d = Drawing(400, 200)
d.add(String(150, 100, 'Hello World', fontSize=18))
renderPM.drawToFile(d, 'test.png', 'PNG')
</code>

.. [1] http://www.reportlab.co.uk/svn/publi...unk/rl_addons/
.. [2] http://www.reportlab.com/ftp/fonts/pfbfer.zip

This sounds like what I was looking for. some how this got missed when
I poked around reportlab land.

Thanks much.

Carl K
Beware... AFAIK this is only a backend for reportlab graphics drawings, IOW it
will render drawings and charts from the reportlab.graphics package but will not
render reportlab pdf canvas.

Dec 26 '07 #18
Grant Edwards wrote:
On 2007-12-25, Diez B. Roggisch <de***@nospam.web.dewrote:
>Carl K schrieb:
>>Grant Edwards wrote:
On 2007-12-24, Carl K <ca**@personnelware.comwrote:

>If it is a multi page pdf Imagemagick will do:
>>
>convert file.pdf page-%03d.png
I need python code to do this. It is going to be run on a
someone else's shared host web server, security and
performance is an issue. So I would rather not run stuff via
popen.
Use subprocess.

Trying to eliminate popen because of the overhead when running
ghostscript to render PDF (I assume convert uses gs?) is about
like trimming an elephants toenails to save weight.
maybe, but I wouldn't be so sure.

currently the pdf is created in a python StringIO buffer and returned to
the browser; so it never becomes a file. using convert means I have to
first save it as a file, convert from file to file, read the file,
delete the 2 files. so 6 file operations where before there were none.
That may be more of a load than the ghostscript part.
So what? I'm not sure about current HD speeds, but a couple of years ago
these were about 30MByte/s - and should be faster today. Which equals
240MBit/s, much more than your user's internet connection. and this is
raw IO speed, not counting disk caches.

Unless the file is really huge (or the server is overloaded),
The server is already overloaded,
the bytes will probably never even hit a platter. If you're
using any even remotely modern OS, short-lived tempfiles used
as you desdcribe are basically just memory-buffers with a
filesystem API.
Good point. Not that I am willing to risk it (just using the pdf is not such a
bad option) but I am wondering if it would make sense to create a ramdrive for
something like this. if memory is needed, swap would happen, which should be
better than creating files.

Carl K
Dec 26 '07 #19
>>>>Carl K <ca**@personnelware.com(CK) wrote:
>CKHere is what the code looks like that generates the pdf:
>CK buffer = StringIO()
CK rw = dReportWriter(OutputFile=buffer, ReportFormFile=xmlfile, Cursor=ds)
CK rw.write()
CK pdf = buffer.getvalue()
CK return pdf
You can pipe the pdf through ghostscript and read the png back from
ghostscript's stdout. Like:

gs -q -sDEVICE=png16m -sOutputFile=- -

Use that command in subprocess with the stdin/stdout as pipes, send
your PDF data to the process and read the PNG output back.

However you must be aware that this can deadlock if the output is large
enough. So putting the input or the output in a real file is probably safer
anyway.

--
Piet van Oostrum <pi**@cs.uu.nl>
URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4]
Private email: pi**@vanoostrum.org
Dec 26 '07 #20
>
Good point. Not that I am willing to risk it (just using the pdf is not
such a bad option) but I am wondering if it would make sense to create
a ramdrive for something like this. if memory is needed, swap would
happen, which should be better than creating files.
You mean permanently deprivating your server of it's precious ram than
only temporarily? And so far, swapping has always been the worst thing
to happen for me - whereas mere disk-IO didn't slow _everything_ down.

You should really check your premises on what is affecting performance,
and what not. And get a faster server...
Diez
Dec 27 '07 #21
Lie
On Dec 27, 7:33*pm, "Diez B. Roggisch" <de...@nospam.web.dewrote:
Good point. *Not that I am willing to risk it (just using the pdf is not
such a bad option) *but I am wondering if it would make sense to create
a ramdrive for something like this. *if memory is needed, swap would
happen, which should be better than creating files.

You mean permanently deprivating your server of it's precious ram than
only temporarily? And so far, swapping has always been the worst thing
to happen for me - whereas mere disk-IO didn't slow _everything_ down.

You should really check your premises on what is affecting performance,
and what not. And get a faster server...

Diez
What resources this server is lacking currently?
Harddisk space
Harddisk bandwidth (the server just wouldn't stop reading/writing at
peak times)
RAM
Network
CPU

In short, what resource is the most precious and what resources you
still have spares?

Possible option:
* Serve the PDFs directly
--Harddisk space - low, as it's not converted
--Harddisk bandwidth - low, depends on how much its requested
--RAM - low, virtually no RAM usage
--Network - low, depends on how much its requested
--CPU - low, virtually no processing is done
--The simplest to implement, moderate difficulty for users that
don't have PDF reader
--Users that don't have a PDF reader might experience difficulties,
nowadays most people have Adobe Reader on their computer, and most
people at least know about it. Many computers are also preinstalled
with a pdf reader.

* Preconvert to PNGs, the conversion is done at another computer to
not restrain the server
--Harddisk space - High, as file is saved as image file
--Harddisk bandwidth - Moderate, as there are many files and overall
are big
--RAM - low, virtually no RAM usage
--Network - Moderate, as the total file served is big
--CPU - Low, virtually no processing is done
--Simple

* Serve a precompressed, preconverted PNGs
--Harddisk space - Moderate-high, should be smaller than just PNG
--Harddisk bandwidth - Moderate-High, as files can't be served in
chunks
--RAM - Low, Virtually no RAM usage
--Network - High, as files can't be served in chunks
--CPU - Low, virtually no processing is done
--Moderately-Simple
--Might be problem if users don't have unzipper (XP, Vista, and most
Linux provides unzipper on default installation, older OSes might not)
--Files can't be served in chunks, users have to download whole zip
before opening any

* Convert the PDFs to PNG on the fly:
--Harddisk space - Low, take as much as serving direct PDF
--Harddisk bandwidth - Moderate to Low, depending on implementation
--RAM - Moderate, as processing is done, RAM is clearly needed
--Network - Moderate, as the files served as PNG
--CPU - High, complex processing is done on the CPU before the file
can be sent to the network
--Complex to implement

Seeing these options, I think it is much better to serve the PDFs
directly, it's very simple, and very efficient on the server. If
you're afraid that not everyone have PDF readers, direct them to
Adobe's site or serve the installation files on the server. The
installation for the reader is a one-off download, so it should only
choke the server for the first several weeks.
Dec 27 '07 #22
Seeing these options, I think it is much better to serve the PDFs
directly, it's very simple, and very efficient on the server. If
you're afraid that not everyone have PDF readers, direct them to
Adobe's site or serve the installation files on the server. The
installation for the reader is a one-off download, so it should only
choke the server for the first several weeks.
AFAIK the OP wants to render previews for display on the site -
certainly a nice feature.

Diez
Dec 28 '07 #23
Diez B. Roggisch wrote:
>Seeing these options, I think it is much better to serve the PDFs
directly, it's very simple, and very efficient on the server. If
you're afraid that not everyone have PDF readers, direct them to
Adobe's site or serve the installation files on the server. The
installation for the reader is a one-off download, so it should only
choke the server for the first several weeks.

AFAIK the OP wants to render previews for display on the site -
certainly a nice feature.
Exactly.

As far as pre-processing goes: the pdf is generated from data the user just
entered into a web page. it may not even be saved to the DB yet.

the new ImageMagick bindings should do what I need:
http://www.procoders.net/?p=39

Carl K
Dec 28 '07 #24

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