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How to work with a scanner available at FI

CANON CanoScan LiDE 100 scanners are available at the faculty, connected to machines nymfe01 respectively. nymfe06 .

The basic utility is scanimage , probably only for the repeated processing of similar templates or other routine tasks. The user-friendly and more opportunistic experimentation is the graphical version xsane . Scanner services can also use the graphics program gimp .

A case-free guide

Underneath the scanner lid, carefully place the original with your hands free of the glass. If you are concerned about the accuracy of the rotation, you should take care of it when saving it and do not rely too much on later manipulation of the scanned image.

The output format of some scanning programs is PNM - portable anymap file format . It is a well-documented and open format that all NetPBM utilities use (see man pnm ), but he can handle it as well ImageMagick (display, convert, and more). The PNM format, for ease of use, does not contain any cost savings and takes up quite a lot of space - you can read the size of the future file (along with the dimension in points). It is worthwhile to convert it into a more economical form (JPEG, ...) after work.

If you're done with your satisfaction, do not forget to take your original from the scanner (again without staining the glass).

What to do in case of trouble

If you can not run or offer you the desired scanner, you can use the command scanimage -L Verify that you can communicate with the scanner. It should list you a list of possible input devices, looking like this:

device `genesys:libusb:001:002' is a Canon LiDE 110 flatbed scanner

Occasionally, even when a scanner is listed in the list of available devices, it can not be communicated to the scanner (the scanning request "hardens"). The most common cause is blocking the corresponding device in /dev by some hanging program. Contact Administrator.

If it fails xsane , try the line scanimage .

If you do not know the advice, send the mail to the address unix@fi.muni.cz . Describe your problem as accurately as possible (what machine and what program you were trying to scan, what were the buzz, ...). The more specific you specify, the sooner you will get help.

A few notes at the end

Make sure that the scanner is kept at all times with utmost care. It is a device not only electronic but mainly mechanical. Try not to bend it on the table (do not damage the gentle shift) and behave well to the lid (especially when scanning from thicker templates). If you place the original on the glass, try not to rub it, rub it and not scratch it. It will also benefit you if you wash your hands first and then you will not be touching the glass. The artwork should also be clean and the scanner safe - you can take a good sample of your shoes. When removing the original, follow the instructions carefully and try to touch the glass as little as possible (if it is not without it). Do not attempt to clean the scanner yourself by a handkerchief or sleeve.

If it happens to you xsane or another program running with the scanner ends in a strange way, check with ps , whether it is still running (perhaps without a visible window). In that case, it is a command kill , eventually kill -9 quit to continue not to restrict access to the scanner to others.

Do not block the scanner unnecessarily. If it is more interested in working with him, it is possible to reasonably agree. Please report any problems to CVT or e-mail to address unix@fi.muni.cz (including a request for cleanup).

If the situation around the scanners becomes intolerable, they will be taken away from the classroom and access to them will become more difficult.