[sane-devel] Slow prreview scans using HP PSC 750...

[Sebastian Rasmussen]

Hi!

[Please CC me since I'm not subscribed to the mailing list]

I've got problems performing preview scans with my HP PSC 750 multifunction 
USB printer/scanner. The preview scans are extremely slow compared to normal 
scans of the entire scan area.

A normal scan of entire scan area takes 25 seconds:
5 seconds calibrating the scanner
10 seconds actually scanning the sheet of paper
10 seconds transmitting the image to the computer

The corresponding preview scan takes around 150 seconds:
10 seconds calibrating the scanner
10 seconds actually scanning the sheet of paper
130 seconds transmitting the image to the computer

Since most of the time during a preview is spent transmitting the image to 
the computer it is natural to believe that problem is USB-related. But since 
a normal scan which ought to transmit much more data is so much faster I 
don't think there's an issue with the USB-communication, but rather some 
part of SANE.

Has anyone experienced similar problems with a HP PSC multifunction 
scanner/printer? Is this a known problem with a known solution that would 
make me go d'oh? :-) I tried to search both the net and the mailing list 
archives, but that was to no avail.

Thanks in advance!

/ Sebastian Rasmussen

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