[sane-devel] Canon LiDE70 support

Steve Underwood coppice12 at gmail.com
Sun Apr 16 00:33:39 BST 2023

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.



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