Apache-Talk @lexa.ru 

Inet-Admins @info.east.ru 

Filmscanners @halftone.co.uk 

Security-alerts @yandex-team.ru 

nginx-ru @sysoev.ru 




      :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: filmscanners: AcerScanwit but also generic calibration

Dean wrote:

>I had assumed that VueScan and other scanner software already did black and
white point compensation, but I think you may be right that they do not do
black point compensation.  I have done B&W compensation for area CCD cameras
I use at work and it greatly improves the uniformity.

My "experiments" are not very good, but when I coupled a totally dense
(color) neg with a totally clear neg on a single frame in my Scanwit,
neither the native MiraPhoto driver nor Vuescan did much of a job of
compensating. Both halves of the "frame" wound up very noisy on the first
(and supposedly calibrating) pass. It was easily possible to
compensate--that is, to adjust half of the frame to black and the other half
to white--but the results of subsequent neg scans wasn't something you'd
want to send home to your mother! ;-)

There's some good chance that I did the experiment wrong, so if others have
tried it with success, I'd welcome your reports.

Best regards--LRA

FREE! The World's Best Email Address @email.com
Reserve your name now at http://www.email.com


Copyright © Lexa Software, 1996-2009.