[sane-devel] plustek backend - lamp-switch option
Hi, On Thursday 18 April 2013 22:32:51 Alexander Hofmann wrote: Hi, Am 16.04.2013 08:24, schrieb Gerhard J?ger: [...] Regarding writing a backend, this one could be a starting point http://www.sane-project.org/backend-writing.txt That one helped me out: I was able to add a new option, dark-scan to the plustek backend, that causes the driver to switch of the lampes the moment the scan begins. It works like a charm - digitizing old S/W negatives works, and so does scanning pictures projected by scanner cameras. As the scanner is recording red, green and blue channels one by one, color's not possible of course, except with using filters and scanning the image thrice, witch might produce some interesting results when using IR, I've yet to check that. If there's interest in the change, I could try to provide a patch, although I'm not very familiar of using git... give it a try and post the patch for review. I'm also not very familiar with git, but it's in fact not that hard to learn... - Gerhard
[sane-devel] plustek backend - lamp-switch option
Hi, Am 19.04.2013 08:09, schrieb Gerhard J?ger: [...] give it a try and post the patch for review. I'm also not very familiar with git, but it's in fact not that hard to learn... - Gerhard Done, I think. I had downloaded the latest stable version (1.0.23) as tar-ball and not via git, which didn't easy up the task, but it's not a big change anyway... The diff is on pastebin: http://pastebin.com/S46jBi36 Looking forward to your comments ;-) -- Alexander -- next part -- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20130419/a812ac5c/attachment.pgp
[sane-devel] plustek backend - lamp-switch option
Hi, Am 16.04.2013 08:24, schrieb Gerhard J?ger: Hi, On Sunday 14 April 2013 16:03:49 Alexander Hofmann wrote: [...] Does that mean that the scanner supports scanning with the lamps off? (e.g. to scan negatives)? no. Switching the lamps while scanning is performed by the backend. Indeed, I located the code (calls to usb_LampOn in plustek-usb.c)... If so, how should I use that option? This option is available to provide a way for a possible frontend like XSane for switching on or off the lamp manually for example before doing a scan. Could be interesting when skipping the warmup option - which is in fact only useful for CCD based scanner that hav a CCFL lamp. Ok, so not what I was searching for. Switching lamps off and on during scans/calibration steps when using CCFL tubes might not be the best idea either... Regarding writing a backend, this one could be a starting point http://www.sane-project.org/backend-writing.txt That one helped me out: I was able to add a new option, dark-scan to the plustek backend, that causes the driver to switch of the lampes the moment the scan begins. It works like a charm - digitizing old S/W negatives works, and so does scanning pictures projected by scanner cameras. As the scanner is recording red, green and blue channels one by one, color's not possible of course, except with using filters and scanning the image thrice, witch might produce some interesting results when using IR, I've yet to check that. If there's interest in the change, I could try to provide a patch, although I'm not very familiar of using git... Thanks for the help, Alexander -- next part -- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20130418/c724d345/attachment.pgp
[sane-devel] plustek backend - lamp-switch option
Hi, On Sunday 14 April 2013 16:03:49 Alexander Hofmann wrote: [...] I'm currently playing around with the SANE API. When listing all options available for my scanner (Canon N670U a.k.a LiDE 20) I noticed an option called lamp-switch. It provides a description saying it's for Manually switching the lamp(s).. Does that mean that the scanner supports scanning with the lamps off? (e.g. to scan negatives)? no. Switching the lamps while scanning is performed by the backend. If so, how should I use that option? This option is available to provide a way for a possible frontend like XSane for switching on or off the lamp manually for example before doing a scan. Could be interesting when skipping the warmup option - which is in fact only useful for CCD based scanner that hav a CCFL lamp. I tried setting it to 1 just bevore starting the scan, but I didn't see any changes. Also, is there any comprehensive documentation about the various options each backand provieds? I checked the manpages, but the lamp-switch option doesn't seem to be documented there. You are right. It's in fact not documented, either because I was too lazy - or it is not useful for command line scanning. Please don't stick on the lamp-switch option. This one is only provided by the plustek backend. Regarding writing a backend, this one could be a starting point http://www.sane-project.org/backend-writing.txt Having a look at the test backend as well. File include/saneopts.h provides commonly used options, but in fact it's up to the backend to define which option it provides. - Gerhard
[sane-devel] plustek backend - lamp-switch option
Hi, there. I'm currently playing around with the SANE API. When listing all options available for my scanner (Canon N670U a.k.a LiDE 20) I noticed an option called lamp-switch. It provides a description saying it's for Manually switching the lamp(s).. Does that mean that the scanner supports scanning with the lamps off? (e.g. to scan negatives)? If so, how should I use that option? I tried setting it to 1 just bevore starting the scan, but I didn't see any changes. Also, is there any comprehensive documentation about the various options each backand provieds? I checked the manpages, but the lamp-switch option doesn't seem to be documented there. Thanks in advance, Alexander Hofmann -- next part -- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 268 bytes Desc: OpenPGP digital signature URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20130414/b6e97b92/attachment.pgp
