On Jan 19, 2009, at 4:15:35 PM, str_online wrote:
This seems to be more complicated than I first thought.
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Yes, life in general, and color management in particular, seem to be that way...
First, I will state my aims, and then ask a few questions.
I take digital photographs. I convert these to jpegs and distribute
them for viewing on cheap consumer grade LCD screens at home.
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That sounds like sRGB work, which would mean gamma 2.2, whitepoint 6500k, Medium brightness LCD, let the CRT be dimmer, and not a threat of controlling your eye's white balance. Use the dimmer CRT for pallettes, etc, and don't worry about it.
No
printing. The ambient lighting is unknown, but usually dim, and LCDs
are bright. I hope that if I adjust some tone visually to neutral
grey, then it also looks neutral grey on the recipients LCD, given
that it is reasonably grey-balanced at similar color temp that mine.
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You can't assume the user's screen is correct, but you can at least shoot for the middle of the range that user LCDs will be in, by calibrating to 2.2/6500, medium brightness.
I have two screens because I want to keep editors open in one and
music player, email etc in the other. I only work with images on one
screen at a time.
Images on the LCD I hope...
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So... back to questions...
I initially calibrated both my CRT and my LCD to 2.2 gamma, 6500K. The
OSD on the CRT allows me to set a color temp 6000K, 6500K, 7000K (and
up). The LCD OSD has RGB sliders.
A few tries:
Cal target Monitor OSD
CRT 2.2 6500K RGB=56,51,46%
LCD 2.2 6500K RGB=43,43,50% bad lcd-crt match
LCD 2.2 5800K RGB=56,51,46% better lcd-crt match
LCD 2.2 5500K RGB=60+,50,40-% I can't even get a neutral white here
- So I guess I should use 5800K for the LCD then? Maybe also try with
6000K for the CRT?
- Should I use 5800K or native fpr the LCD, by the way?
If sRGB, meaning the web, is your target, then 6500k is your whitepoint.
- Does this CRT-LCD matching have some adverse effects?
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Yes, it drives people crazy, trying to do an improbably task. It also can have side effects, like causing headaches, since one screen has a visible refresh rate and the other does not. And it has a weird depth issue, where the CRT image seems to be at some indeterminate depth behind the think, heavily tinted glass, and the LCD image appears to be right at the surface behind the thin, untinted plastic...
Or should I
just accept that the image looks different on two screens? That there
cannot be something that's neutral grey on both screens at the same
time? References, howtos, other litterature?
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It would be nice to at least get the gray balance the same on both, I agree, but given the mixed pair, I'd suggest using the LCD for all image editing, and leaving the CRT dimmer, so that its not effecting your perception. And when you get a few bucks, buy a better LCD, and use the current one as your pallet monitor, and trash the CRT, quick; before they start charging huge dump fees for them! I suspect that in a couple of years it may cost more to dispose of an old CRT than it does to buy a new LCD...
--
C. David TobieWW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/spyder3