Re: Profiling LCD monitors
Re: Profiling LCD monitors
- Subject: Re: Profiling LCD monitors
- From: Don Hutcheson <email@hidden>
- Date: Sun, 05 Oct 2003 13:07:17 -0400
Bob et al,
Here are some tips for getting the best out of basICColor display and LCDs.
1. Download the very latest version of basICColor display.
2. Don't even go near the CRT setup controls. Leave them off.
3. Adjust Apple LCD displays to maximum brightness unless you are working
in a cave, in which case add some light to your environment so you can use
the LCD at max brightness (one of the main advantages of LCD.)
If you reduce the brightness of any LCD, expect to see less shadow detail
and more banding.
4. On a Sony SDM-P232W, set the hardware as follows;
Backlight: 100
Contrast: 70
Brightness: 50
Color: 5000K
Gamma: 1
This is a good starting point but you may want to experiment. Be careful
though, as most of these controls do NOT work the same way as on a CRT and
can quickly lead to clipping or plugging in one or more vLUTs, which in turn
can reduce profile accuracy or increase the chance of banding.
5. If you do NOT have an adjacent dimmable D50 light booth like the GTI
SOFV-1e, either set your white point to D50 or D65 according to taste. If
you want D65 you're better off opening the Curve Editing panel and clicking
the little padlock symbol at the top right of the curve. When locked you are
choosing "Native color temperature" (about D65 on Apple LCDs.)
6. If you DO have an adjacent dimmable D50 booth or you want to try and
match the color of your ambient lighting, ignore the D50/D65 buttons and
click the "Measure" button instead. This allows you to measure the ambient
light, which is then transferred to the app as x and y values. In later
releases you can type in your own x, y values which is way more accurate
than Kelvin numbers.
7. To measure the color of ambient lighting, point the measuring device at
a piece of NEUTRAL white or grey material illuminated by the ambient
lighting or the viewing booth. Pointing most devices directly at the source
will over-laod the device and gives false readings.
To see if your material is neutral, measure it with a spectro and ensure it
has 0 a* and 0 b*. If the material has some non-neutral color, the screen
will be biased to the same color, which may work well if you only print on
one stock, but will screw you later if you try to do "Simulate White Paper"
in Photoshop.
Note: I don't recommend calibrating an LCD to match tungsten.
8. Ignore the Gamma number. In current versions of BD you get an optimized
curve that is neither 1.8 or 2.2 but which minimizes banding.
9. Once you have profiled the screen, open my "White Balance RGB" image
(www.hutchcolor.com - Free - Targets and images) and look for color or tone
banding. If you see any obvious color shifts you can try editing the
individual RGB vLUTs.
Note that here will always be some residual tone banding until Apple (or
someone) comes out with a deeper than 8-bit/channel video card.
Let me know if this helps,
Don
******************************
Don Hutcheson
Hutcheson Consulting
(Color Management Solutions)
Washington, NJ 07882
Phone: (908) 689 7403
Mobile: (908) 500 0341
Fax: (908) 689 5305
E-mail: email@hidden
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