[sane-devel] High DPi Scan using Ubuntu 18.04.3

[Ralph Little]

Hi,

On 2020-01-01 11:13 a.m., Sotirios Giavis wrote:
> I want to scan an area of 50 x 50 mm at 4800 dpi in full-colour 16 bits.
> This should be possible with Canon Lide 210 but my system won't.
>
I confirmed the specifications of the scanner that it should indeed be 
optically capable of 4800dpi.
I have one of these scanners and I just tried it out. Indeed, in Sane 
1.0.28, 4800dpi is not currently supported and scanning is dropped down 
to 2400dpi.

Looking at the code of the Genesys backend, I see this:

     model.resolutions = {
         {
             { ScanMethod::FLATBED },
             // BUG: 4800 resolution crashes
             { /*4800,*/ 2400, 1200, 600, /* 400,*/ 300, 150, 100, 75 },
             { /*4800,*/ 2400, 1200, 600, /* 400,*/ 300, 150, 100, 75 },
         }
     };


That suggests that it should be supported but is buggy at the moment.
If I have time this weekend, I will look into it.

Cheers,
Ralph