[sane-devel] Epson Perfection 610 Issue with 150 dpi scan

[m. allan noah]

<snip>

> Alessandro, do you know why the color shuffling algorithm is there?
>
> Why are lines from the beginning and the end removed?
>
> If the input is 1754 lines, would we then expect that more sould be scanned
> (e.g. 1762) and the we remove 4 at the beginning and the end respectively?
> And how many bytes are then really read? worth of 1758 lines???
>
> Just random thoughts since I do not really understand what is going on
> there....
>

I cannot comment on the specific limitations of this scanner, but this
kind of issue used to be common, but now only happens with cheap
scanners. The machine's RGB channels are not read from the same row at
the same moment. Rather, they are offset by some number of lines. So,
the driver might have to scan some extra, and throw it away, and
descramble the rest.

allan
-- 
"The truth is an offense, but not a sin"