[sane-devel] Plustek OpticPro A320E (07b3:1826): third version published - no attachment this time

[thierryh at vivaldi.net]

Hi Tero,

Great job! Why not propose integrating this into sane/backends?

Thierry

Le 2026-09-03 18:47, Tero Kankaanperä a écrit :
> Hello list,
> 
> On the subject of Plustek OpticPro A320E backend...
> 
> THIRD VERSION IS PUBLISHED
> 
>   https://terokankaanpera.fi/a320e/
> 
> Since the published 2026-08-28 version:
> 
>   - x scale corrected: 0.75 % long before, 0.9991 +- 0.0001 now, 
> measured
>     with a ruler at 200, 400 and 800 dpi
>   - the whole bed is scannable, 304.8 x 431.8 mm, and the black tail 
> and the
>     comb of stripes at the right-hand edge are gone
>   - the lamp now goes out when the carriage starts back, +0.22 s after 
> the
>     last image byte (CommandSetGl124::save_power is empty upstream)
>   - the motor acceleration curve is the vendor's measured table rather 
> than
>     the constant-acceleration model, reproducing the vendor entry for 
> entry
>     at five of six resolutions
>   - FWDSTEP/BWDSTEP are written per phase and FSTPSEL is no longer tied 
> to
>     STEPSEL, both as the vendor does
> 
> One of these changes what a user must do: the white calibration target 
> now
> has to be at least 305 mm wide, because this scanner has no internal 
> white
> strip and A3 paper is 8 mm too narrow. The README says so up front.
> 
> Patch: 17 files, +3394 / -28, against master fcaa30a7.
> 
> Everything that would have made this message long is in changes.md at 
> the
> same URL: the version-by-version account, what was measured, and the 
> four
> places where I found a difference against the vendor and deliberately 
> did
> not copy it.