[sane-devel] Any hints on how to start support for GL128-based Plustek Film Scanner OpticFilm 120?

[Ralph Little]

Hi,

On Sun, Sep 29, 2024 at 5:47 PM Erik Beck of Tahoma <bacon at tahoma.com>
wrote:

> It might actually be based on a GL126 and an AD9826; Here's some string
> analysis:
>
> data1.hdr: DRV_U_GL126_A31
> data1.hdr: AD13719F-9FE1-46C2-AB8B-716B5F256BF8:ScndrvU_GL126_A31
> data1.hdr: Ver:1.0.0.5_ (12/08/2014)_(## GL126_Plustek_A120
> 12clk,AD9826) PRODUCT.dat: AsicID = GL126
>
>
AFAIK, the GL126 scanner-on-a-chip doesn't have a publicly available
datasheet.
That makes is quite difficult to figure out how to support it.

The easiest method for getting a basic scan is to capture traffic, and
replicate it back to the scanner.
The harder part though is to figure out how to extract the details
necessary to determine how scan area is determined etc which vary with each
scan.
To do a good job, you also need to figure out how to do calibration to an
acceptable degree to get a decent scan.
This typically involves taking test scans from a target area outside of the
normal scan area, formulating adjustment tables, feeding them back to the
scanner, and iterating until an acceptable result is obtained.

It's not for the faint of heart that's for sure.

Cheers,
Ralph
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