[argyllcms] Re: question about monitor calibration
- From: Roger Breton <graxx@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 26 Jan 2013 10:05:01 -0500
I would like to bring to your attention that matching the "brightness" of
the print is not optimal for the following reason.
Assuming the calibrated while point then is made equal to the print
luminance.
Take an image viewed in Photoshop, using "Simulate Paper White", which is
what you want to use for soft-proofing images on a monitor, the calibrated
white point luminance then is significantly reduced down because of the
print/paper white point L* value which is NOT 100. In the case of
SWOP2006_C3, for instance, the monitor white point has to come down from L*
= 100 = 160 cd/m2, say for IDEAlliance and Fogra certification, to L* = 92 =
about 130 cd/m2.
So it might be a good idea to crank out the monitor calibrated luminance in
anticipation for this effect. Instead of matching exactly the measured
"brightness" of the print, why not bump it up a little? So that when
Photoshop "Simulate Paper White Point" kicks in, we retain much of the
measured "brightness" falling on the print.
My two cents.
/ Roger Breton
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Ben Goren
Sent: Saturday, January 26, 2013 9:40 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: question about monitor calibration
On Jan 26, 2013, at 4:12 AM, Alberto Ferrante <alberto.ferrante@xxxxxxxxxx
<mailto:alberto.ferrante@xxxxxxxxxx> > wrote:
My understanding was that for sRGB a "dimly lit" room was assumed.
I think I can address some of the confusion.
The purpose of Argyll's matching of ambient conditions is so that a print
viewed under those conditions will look the same as the image displayed on
the monitor.
So, if you're going to work in a dimly-lit room, if you want to hold a print
up to the monitor and see the same thing on both, the monitor is going to
have to be equally dim.
The better solution is to get (or improvise) a viewing station placed next
to the monitor. You'd keep ambient illumination reduced, but you'd put the
instrument where the print would go in the viewing station when making the
ambient measurement.
First, of course, you'd want to get the display's native brightness and the
viewing station as closely aligned as possible, such as by filling the
monitor with a white screen and putting a piece of white (FWA-free) paper in
the viewing booth. You can then use the brightness controls on either or
both of the display and viewing station to get them to match. Eyeballs can
work, but a Sekonic meter in spot mode is even better.
Cheers,
b&
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