Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!ccu.umanitoba.ca!herald.usask.ca!alberta!brazeau.ucs.ualberta.ca!unixg.ubc.ca!ubc-cs!uw-beaver!zephyr.ens.tek.com!uunet!stanford.edu!unixhub!slacvm!gjm From: GJM@SLACVM.SLAC.STANFORD.EDU Newsgroups: comp.graphics Subject: Re: Scanning negatives (Re: Can handheld scanners scan BACKLIT images? Message-ID: <91179.133029GJM@SLACVM.SLAC.STANFORD.EDU> Date: 28 Jun 91 21:30:29 GMT References: <2835@umriscc.isc.umr.edu> <4993@gmdzi.gmd.de> <5031@gmdzi.gmd.de> Organization: Stanford Linear Accelerator Center Lines: 16 >There is no switch, and the documenation doesn't describe the interface. >Logitech offers some kind of programmers toolkit for the scanner, but >I don't know how much it costs. Perhaps it allows switching the light >independent of the scanning function. The logitech tool kit is free (or at least the cost of a USnail stamp)... but the scanner and tool kit from DFI is much better (ie, more programmable) - the main problem w/ the LT program interface is: you call the scan routines, pass them a memory buffer to scan into, the routine scans until it's run out of buffer space, you timeout or hit a keystroke... the rub being: at 300 or 400 dpi and with an abs max buffer of 640k, you can only scan a very limited area. The DFI kit on the otherhand allows for the scanner to return a scan line at a time, which one can stash in expanded or extended memory, and then after the whole scan is done, one can go off and process the results. =greg