[sane-devel] OT: scanimage output format

[Wolfgang Pichler]

this means it is impossible when i use png as output format - what about
jpeg ?

the client timeout is not the problem - its more a "user-timeout"
problem. I'd simple like that the user can see what actually gets
scanned.

Or does there anywhere exists an pnm implementation for mozilla ?

mfG
Wolfi

Am Mon, den 27.10.2003 schrieb m. allan noah um 16:58:
> not possible to use png's progressive loading, cause it uses Adam7, which 
> needs a low-resolution version of the image at the beginning of the file, 
> followed by multiple (effectively) higher res versions.
> 
> if your client is timing out, you could try sending them a redirect to 
> keep the page refreshed. but then you will need to store your output on 
> the fs or in a db for retrieval...
> 
> allan
> 
> On Mon, 27 Oct 2003, Wolfgang Pichler wrote:
> 
> > hi all,
> > 
> > for a webapplication i am calling scanimage the scan a contract in the
> > client scanner - i am calling it with
> > $fd = popen('SANE_DEFAULT_DEVICE="net:'.$client_ip.':plustek" scanimage
> > -l 0 -t 0 -x 210 -y 288 --mode Gray | pnmtopng','r');
> > $output = "";
> > while(!feof($fd)) {
> > 	$output .= fread($fd, 1024);
> > }
> > pclose ($fd);
> > echo $output;
> > 
> > (the correct headers also get set before)
> > 
> > this already works.
> > 
> > But with that call the hole image gets scanned and that converted into
> > png format (so that the browser can read it). What I'd like is to get
> > scanimage to output the scan directly in png format (or a program which
> > can directly process the the data and convert it to png on the fly -
> > while the scan still runs) - so that while the scan runs the scan get
> > directly outputed on the client (so that the user can see the progress).
> > Is this possible ? And if its possible, how ?
> > 
> > mfG
> > Wolfi
> > 
> > 
> > 
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> >