[filmscanners] RE: Monitor calibration

["Laurie Solomon" <laurie@advancenet.net>]

Alex,
DO NOT TAKE THIS AS GOSPEL; I repeat do not take this as gospel.  I think
that, given your last statement, it may be possible that they are using two
different methods of measuring or determining gamma.  Your monitor
manufacturer, like some display adapter card manufacturers, may be using
some sort of lineal yardstick type of measure where 0 is the lowest setting
and a plus x is the highest setting while the Adobe Gamma program uses a
sort of bilineal measure with a -3 as the lowest and a +3 as the highest
setting and 0 beng in the middle.  If this is the case, we are not talking
comparable apples or oranges but vegtables versus pastery. :-)

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Alex Zabrovsky
Sent: Thursday, April 25, 2002 6:33 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: Monitor calibration


Understood, thanks,
Basically, I adjusted contrast and brightness of the monitor according to
the instructions of Adobe Gamma utility (full contrast, brightness was
settled at about 45-50 %).
BTW, trying to set this gamma explicitly in Photoshop produced an error
stating that Photoshop will not accept gamma value greater then 3. That
really confused me, since as for my understanding if the developers of
Photoshop limited it my this value, the real world gamma indeed should be
lower.

Regards,
Alex Z

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Laurie Solomon
Sent: Wednesday, April 24, 2002 10:21 PM
To: alexz@zoran.co.il
Subject: [filmscanners] RE: Monitor calibration


>However, they insisted on using quite exaggerated gamma (3.06) with the
coordinate values they provided and this gamma indeed seemed to be extremely
high for my liking, so I went back to regular one (measured visually in
LittleCMS as about 2.4).

A gamma of 1.8 for Macs and 2.2 for PCs is usually regarded as normal.  The
eggaggerated gammar that they suggest my be based on your monitor's
brightness and contrast level controls (actually on the monitor itself
physically or electronically controlled via on-screen controls)being set at
a particular level.  If you turn the brigtness down and the contrast up, a
different gamma from that called for by the manufacturer (3.06) might be the
appropriate one for that set of settings.

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Alex Zabrovsky
> Sent: Wednesday, April 24, 2002 10:51 AM
> To: laurie@advancenet.net
> Subject: [filmscanners] RE: Monitor calibration
>
>
> Well, just tell me when you will need it.
> They specified the phosphors type to be P22 which is one the
> standard types
> offered in Adobe Gamma or LittleCMS, however the color
> coordinate values
> slightly differ from standard P22.
> Frankly, I didn't noticed any changes creating the profile using these
> values comparing to specifying just P22.
>

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