Re: [sane-devel] Canon LiDE70 support
On 15/04/2023 22:24, Ralph Little wrote: Hi, On 2023-04-15 12:49, Steve Underwood wrote: Hi, I just found there is sane support for our old Canon LiDE70 scanner. I can scan with this OK, but the colour balance, contrast, etc. looks very strange. I noticed the man page says auto-calibration is not supported. Are there any tools to sort out the image quality settings easily? Perhaps by scanning a reference image? Regards, Steve I don't believe so. Most scanners can perform auto calibration with reference to hidden black and white strips inside the case. For a lot of these scanners that use scanner-on-a-chip designs, that process has to be performed by the driver code and I don't think that has been written for this scanner as yet. Cheers, Ralph I understand about the auto calibration. I was a contributor to SANE about 20 years ago, implementing the backend for some Acer scanners. I would try to help sort out this Canon driver, by tracing what the Windows drivers do, but they stopped updating that driver at Windows 7. I don't have anything old enough to run the old driver and monitor the USB traffic. Regards, Steve
Re: [sane-devel] Canon LiDE70 support
I think also depending on what software you use to scan makes a big difference some software has the ability to process the image according to a defined preset or even auto mode. Seems to me I discovered much the same on an old cannon scanner some years ago. On Sat, Apr 15, 2023, 2:24 PM Ralph Little wrote: > Hi, > > On 2023-04-15 12:49, Steve Underwood wrote: > > Hi, > > > > I just found there is sane support for our old Canon LiDE70 scanner. I > > can scan with this OK, but the colour balance, contrast, etc. looks > > very strange. I noticed the man page says auto-calibration is not > > supported. Are there any tools to sort out the image quality settings > > easily? Perhaps by scanning a reference image? > > > > Regards, > > > > Steve > > > > I don't believe so. Most scanners can perform auto calibration with > reference to hidden black and white strips inside the case. > For a lot of these scanners that use scanner-on-a-chip designs, that > process has to be performed by the driver code and I don't think that > has been written for this scanner as yet. > > Cheers, > Ralph > >
Re: [sane-devel] Canon LiDE70 support
Hi, On 2023-04-15 12:49, Steve Underwood wrote: Hi, I just found there is sane support for our old Canon LiDE70 scanner. I can scan with this OK, but the colour balance, contrast, etc. looks very strange. I noticed the man page says auto-calibration is not supported. Are there any tools to sort out the image quality settings easily? Perhaps by scanning a reference image? Regards, Steve I don't believe so. Most scanners can perform auto calibration with reference to hidden black and white strips inside the case. For a lot of these scanners that use scanner-on-a-chip designs, that process has to be performed by the driver code and I don't think that has been written for this scanner as yet. Cheers, Ralph
[sane-devel] Canon LiDE70 support
Hi, I just found there is sane support for our old Canon LiDE70 scanner. I can scan with this OK, but the colour balance, contrast, etc. looks very strange. I noticed the man page says auto-calibration is not supported. Are there any tools to sort out the image quality settings easily? Perhaps by scanning a reference image? Regards, Steve
