Hi, On Fri, Apr 04, 2003 at 08:50:52PM -0600, [email protected] wrote: > I just set up the 2.4GHz machine and the 66 MHz machine side by side, > scanned the same picture with the same scanner with both machines, and > copied the file from each to the other. The result is that the scan > done on the 2.4 GHz machine has severe moire effect, while the scan > done on the slow machine looks good, when viewed on either machine. > The raw bits files from scanimage are of identical size on the scan from > either machine. (But the files differ, starting at byte 38, line 5)
Please send me both files. But not as jpeg but in a lossless format like pnm. Please also sned me the command line switches/options used for both images for scanimage. > Does anybody have a clue why the speed of the CPU seems to make a > difference? Or what else it might be? Theoretically that could be a timing problem, i.e. your computer is too fast :-) Maybe the scanner expects some pauses at a certain point of the protocoll and with faster computers the commands are just to fast. The protocol of these scanners is broken/not conforming to the USB spec anyway, so I wouldn't be surprised. On the other hand, I'd expect I/O errors and not moire artifacts in such a case. And nobody else reported such problems until now. With a 1.4 MHz Athlon it doesn't happen and I don't have a faster one currently. Is the scanning time different significantly? Try "time scanimage >image.pnm" on both computers. Bye, Henning
