[sane-devel] Where do I download the software for a Canon Pixma TR4520?

Alexander Pevzner pzz at apevzner.com
Mon Mar 23 14:00:15 GMT 2020

Hi Thierry,

On 3/19/20 11:54 PM, Thierry HUCAHRD wrote:
> I'm currently working on ADF. The idea being to have a complete support.
> The support provided by sane-airscane ADF does not work for Canon IR ADF 
> scanners.

I've reviewed your ADF implementation with big interest. Nice to meet my 
own code in somebody else's project without any reference to its origins :-)

I have a question and a couple of comments.

1) Is it correct, that this line, commented out in my version but 
present in your version, is sufficient for Canon IR to work?


2) In your merge request comment you wrote, that your version scans only 
the first document from the ADF. From my experience (probably, it 
depends on hardware), it scans the entire ADF load, even if software 
doesn't fetch ready pages. I bet there will be a sufficient amount of 
scanner models that will hang or crash when memory is full - this is 
much better to load as much pages, as scanner sends, even if user 
doesn't read them.

3) When scan to PDF, duplex ADF sends 2-page PDFs, so it is better to be 
prepared to it. I don't have this problem, because I intentionally don't 
implement PDF, as I think that benefit of having 1-bit B&W is low, while 
added dependencies (and memory overhead) are unreasonably high.


	Wishes, Alexander Pevzner (pzz at apevzner.com)

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