Digital BW, The Print

Andre,

This parallels a discussion in progress on the Piezography list. What
you did when calibrating your two LCDs was not to calibrate your two
LCDs but to calibrate the video board of your computer because that is
what EyeOne and CV Spyder, etc do. Your video board when it is not
calibrated has the ability to output 256red x 256green x 256 blue
output levels to produce 16.7 million colors. In order to render
grayscale without banding you need all those levels...

What calibration does is to reduce the output levels of the video
board in order to realize the targets of color temperature,
brightness, etc... and saves this as a vLUT which loads when you
startup your computer. Think of the vLUT as three curves being applied
to your video board...

Calibrator displays like the Eizo CG series have an on-board hardware
engine that produces billions of colors. The video board is left at 8
bit (16.7 million colors), and the calibration procedure tunes the
actual engine to select the most appropriate 16.7 million display
colors. Of course this display has an additional cable running to the
computer and when the EyeOne instrument or CV instrument is measuring,
the Eizo software is adjusting the hardware engine of the display. The
video cable and this additional cable are forming a loop. And this is
why calibrator reference displays which calibrate in hardware rather
than software can display amazingly good grayscales. The Sony Artisan
was THE example of a calibrator display. The Eizo CG series advertises
itself to have nearly the same capability.

If you can intervene in the Expert or Advance mode of the EyeOne and
use the Samsung manual controls (if they exist) to dial in the target
color temp, brightness and contrast, you may have a better chance of
having the EyeOne Match produce a less evasive vLUT on your video
board. The idea being here not to just let EyeOne measure your native
temp and brightness, etc but to select the manual portions of Match to
dial in these by hand.

Earlier versions of the software allowed this. I am hopeful yours
still does. I can't check as I only use Artisans. But launch and see
if there is an Expert Mode or a mode which allows you to use the
display controls to dial in to the target. CM used to have a setup
which alerted you when the target was reached. Color Temp is very
critical here as the vLut just yanks down the output of 1 or more
channels in order to get there... it clips.  :(

Prove it! a very old monitor calibration system used to display the
vLUT simultaneously...  was magic in allowing the user to try and
leave it as intact as possible. Its discontinued but there must be
software out there that you can use with the EyeOne that really allows
you to do as much as possible on your own. Of course your Samsungs
have to give you access to their engine in some way or the whole point
is moot.

Hope this helps,

Jon Cone



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "andre1moreau"
<andre1moreau@...> wrote:
>
> Hello,
> 
> After calibrating two Samsung monitors, one 22" and one 30" with 
> GretagMacbeth Eye-One Match 3, I've noticed that when displaying a 21
> Grayscale Stepwedge, there are still traces of red in a some of the
> wedges. 
> 
> Another run at calibration was undertaken with BasICColor trial
> software. Same results with the stepwedges.
> 
> Is this something expected of LCD monitors, or is there something I'm
> missing?
> 
> TIA,
> Andre
>