[sane-devel] EPSON 3490, calibration and raw data

[Krzysztof Halasa]

Hi,

Kai-Uwe Behrmann <ku.b at gmx.de> writes:

>> Is this scanner really 48-bit (3 * 16 bit)? Can I really get full 16-bit
>> data from it?
>
> This certainly not for the above device. I would guess 10-14 bit with 
> appropriate noice.

I've measured the usable (negative film) signal range and it gives
more than 14000 different levels, so it seems internally at least
14-bit. It's marketed as "48-bit in 48-bit out", though.

> You have to test if 
> the tonal range is good enough for negative scanning. Not shure if newer 
> consumer scanners are better in this field.

Actually it is "newer" consumer scanner, just a bit low-end and I think
it needs some more software tweaking.
-- 
Krzysztof Halasa