[sane-devel] ScanJet 3200C
On Mon, Mar 24, 2003 at 06:31:01PM -0300, Alejandro Noli wrote: OK. The problem seems related to /dev/parport0. Check its rights: #ls -l /dev/parport0 crw-rw-rw-1 root root 99, 0 mai 20 2002 /dev/parport0 it should be rw for any users. Also check that ppdev character device is loaded: #dmesg|grep ppdev ppdev: user-space parallel port driver Oops... i got this off... but, now i included it into the kernel with modconf, but still the same. Nothing happens whit scanimage -L If any other suggestion... Gracias. (Thanks) Regards, Stef Hello, can you try the little info script available at: http://umax1220p.sourceforge.net/trouble.html and send me the output ? Regards, Stef
[sane-devel] Affordable film scanner
The Canon FS27XX scanners are cases where you need a large gamma to obtain good results (2.0-2.5). Right now the backend collects 12-bit data and converts them to 8 bit with a 4096 byte gamma table (or exports them as 16-bit data). This usually works well; but I admit that there are situations where a few more bits of depth would be welcome. Even if your scanner has got exposure controls, the question remains whether it scans with fixed settings and manipulates the raw digital data, or whether it really adjusts the gain and zero of the amplifiers. This is probably the point where some companies try to save money; good analog circuitry is expensive. Regards, Ulrich Deiters
[sane-devel] Affordable film scanner
The Canon FS27XX scanners are cases where you need a large gamma to obtain good results (2.0-2.5). Right now the backend collects 12-bit data and converts them to 8 bit with a 4096 byte gamma table (or exports them as 16-bit data). This usually works well; but I admit that there are situations where a few more bits of depth would be welcome. That's the case for Coolscans just as well. Even if your scanner has got exposure controls, the question remains whether it scans with fixed settings and manipulates the raw digital data, or whether it really adjusts the gain and zero of the amplifiers. This is probably the point where some companies try to save money; good analog circuitry is expensive. Analog gain doesn't do too much good because the limiting factor is always the CCD, not the ADC -- you would only be amplifying extra noise if you increased analog gain. What Coolscans do is to let you allow to change the exposure time for each channel separately. This way you get the best of it all -- twice the exposure means sqrt(2) better signal-to-noise ratio. Changing the exposure separately per channel is a bit tricky with scanners that use a white light source, since all colours are scanned at the same time, whereas the Coolscans scan one after the other. But it should still be possible to change the overall exposure time -- are you definitely certain that the FS27xx doesn't allow you to do that, or is it just the current drivers (Window$ or SANE) that can't do it? Andras === Major Andras e-mail: and...@users.sourceforge.net www:http://andras.webhop.org/ ===
[sane-devel] positive report on Canon N670U; couple of questions
Hi, On Mon, Mar 24, 2003 at 06:23:07PM -0600, Theodore Kilgore wrote: Question 1: Sorry, just what do I do to make the scanner accessible to users, not just to root? I should know, but I forget. Do I chmod the device? Yes, at least if you use /dev/usb/scanner*. If you use libusb, the approach is different. scanimage -L shows the device you use. See man sane-usb for details. Or do I setuid root the executable? No. Never do this. Question 2: This may be off topic, but perhaps someone can point me in the right direction. I wanted to scan a picture and try to use it for background in X. Strangely, the preview image shows pretty much the whole thing, but when I open the picture with gimp I can only see part of the image Which SANE frontend do you use? XSane? It will scan the area you have selected in the preview window or with the geometry sliders. If you use xsane in viewer mode, it will show you exactly what you have scanned. . I suspect that I have the whole thing, but I am not sure. Anyway, I can't see it all after doing the scan, only a small piece of the original. This could be either a problem with gimp setup Use the sliders and gimp's zoom feature to check. But usually gimp shows the complete image by default. or with the scanner setup, since the last time I tried to use the scanner I wanted to zoom in on a small piece of the image, for testing purposes. So maybe it needs to be reset? If so, how? Look at the top of the preview window. There are several ways to select the zoom and selection. Bye, Henning
[sane-devel] SANE Java
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Hello,
I don't know whether my earlier mail reached the mailing list or not.=20
=20
I would like to know if someone has worked on the SANE Java =
combination.
Please let me know if there is any Java backend for SANE.=20
=20
Further, I would like to know if we have a SANE backend for Windows =
platform
too.
=20
Rgds,
=20
Sanjay Godbole
=20
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[sane-devel] SANE Java
Hi, On Tue, Mar 25, 2003 at 09:29:25AM -0500, Sanjay Godbole wrote: I don't know whether my earlier mail reached the mailing list or not. I don't think so. Maybe you have used an address that wasn't subscribed at that time. I would like to know if someone has worked on the SANE Java combination. There is japi, it's in the sane-backends source code. It's a library to allow access to sane over java, there is also a java frontend. This code is quite old and I wan't able to get it running. Please let me know if there is any Java backend for SANE. Silvio Vogt blackhol at web.de has worked on fixing/updating the java code, but it's not completely finished yet. Contact him for details. Further, I would like to know if we have a SANE backend for Windows platform too. There is no backend for Microsoft Windows. Well, to be exact, the net backend works on MS Windows in a hacked version together with xsane. I guess porting to MS Windows would be a major hazzle and nobody who uses this oerating system seems to be interested in doing this. Links to frontends and other stuff for MS Windows can be found on the SANE homepage. Bye, Henning
