Steve I have to re-calibrate my monitor since I've just re-installed windows XP and when I do so it shows that the red is way up, but the colors on screen look good.  I use the profile I'd created in early September and set the windows color management to this.  Can you tell me what luminance level I should aim for?
I know we talked about this in the past but I cannot find the email that relates to this topic.


Hi Charles -

It probably isn't a good idea to use your old color profile unless you can be 100% certain you're using the same hardware and the same video card drivers as before.  If anything is different in this mix the old profile will be out of whack.

The values, Luminance/Gamma/Whitepoint, are paired in such a way that they should be selected together as a set.  And each one depends on your monitor, its type (desktop/LCD/CRT), your ambient light temperatures, and ambient light levels.  Either one of these variables might dictate a different value.

And.. there is the consideration of your end use whether it be prints at your local print shop, display on your computer monitor, or perhaps CMYK for print in magazines and brochures.

So.. there is no "right" values.  There are only values that fit your individual needs best.

What I can do is give you some values and conditions that I've used over the year sand you can decide if they're close enough to your needs.

1.  General use, prints at your local print shop, display on your monitor, normal light levels.

Desktop LCD:  6500k/2.2/120

Notebook LCD:  6500k/2.2/90

CRT:   6500k/2.2/100


   2.  CMYK pre-press, brochures, magazines, controlled 'dim' light levels.

Desktop LCD:  5000k/2/100

Notebook LCD:  5000k/2/80

CRT :  5000k/2/90



3.  Professional prints, pro-level inkjet, controlled 'dim' light levels.

Desktop LCD:  5500k/2.2/110

Notebook LCD:  5500k//2.2/90

CRT :  5500k/2.2/90


Remember, these are personal preferences.  Your calibration software might 'recommend' values.. but these are just values taken from an average of personal preferences.. and adjusted to work best under average conditions.

As you can see.. you'll probably need to experiment with your settings and see which suits your needs the best.  For instance, if you're main use is prints at the local print house then your measure of success would be if what you saw on your monitor matched the prints made from your files.  Remember, there are two reasons/uses of being color profiled.


a.  So your files are close to a standard for sharing on-line, with customers who do their own printing, or any other type of sharing with anyone who will be viewing your files on a display.

b.  So what you see on your monitor is what you're getting from your prints.


As far as your Spyder and its reading the red..  I don't know as I don't use this particular colorimeter or software.  I'd say if it looks good, matches your intended use (a&b above), and isn't clipping any of your color channels (red specifically in this case) then you're doing fine.

Also know that when you say it looks good to your eyes.. you're now trusting that your eyes have enough experience to act as a sort of colorimeter.  I know guys who can do this.. they'll instantly recognize a profile that's off.. and really it depends on how far off it is.. when sorting how much skill it takes from the "eyes" to recognize.  It took me a decade of color profile use, tens of thousands of hours sitting in front of color profiled monitors, et.. to reach a certain level of competence where I could judge by looking.  Probably there are some gifted individuals who can do this in much less time.

I hope this helps.




I had made a mistake when trying to calibrate my monitor, I had forgotten to add the LCD adapter to the puc and was getting a false reading. Now I have been able to get a proper reading but I have found that my monitor is not good. The readings are 27 for red, 27 for green and 100 for blue (100 is max). Luninace is 106. I think in the near future I am going to have to invest in a better monitor.


Charles -

I'm glad you're making progress.

Consider that the "balance" of the channels might be making the need for the blue channel to be pumped up.  Try backing off the blue channel and then adjusting the red and green channels.  It's a tricky balance sometimes.

Also.. once you find a balance.. then you can jockey your channels up a bit each while maintaining the balance, and making your luminance higher.

I hope this helps.


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