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: creating correction curves from scanned calibration chart?

>From: "michael shaffer" <rarewolf@roadrunner.nf.net>
>   Because my system is calibrated, I am not assuming.  If my monitor is
>truely gamma calibrated, and I use a gamma=2.2 working color space, then a
>18% gray card's RGB value should be R=G=B=117 (see formulas below, they
>aren't mine).  I ask you ... under what circumstances would an 18% gray 
>be anything else? (you may also assume I have ambient illumination under

your assumption being that 0,0,0 is totally black and 255,255,255 is totally 
white in that 2.2 gamma colour space. Would be a pretty daft colour space as 
you can't get either on a monitor or printer and so you end up wasting a 
whole bunch of values that could never be properly expressed.

generate an icm profile for you monitor (i.e. with a color sensor) and 
scanner and ignore the rgb values.


Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp


Copyright © Lexa Software, 1996-2009.