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What is the Best Multi-Monitor Calibration Tool?
sojourndeath asks: "I am looking for a good way to calibrate multiple monitors (30-40), so that their color looks similar? It seems like everything I find is for profiling your monitor to your printer and scanner. I need to be able to have a bunch of users see the same color on any monitor? Does anyone have a good, accurate way of doing this?"
You're going to have to calibrate each monitor separately using the same calibrator.
Repeat once a month or so.
I don't envy you having to do this!
Some people are like slinkies--basically useless but they bring a smile to your face when pushed down the stairs.
I hope that they're all the same brand, or as the previous post mentioned i dont envy you. Some brands (Barco for one) have *luxury* an auto-calibration tool for some of their monitors. From observation, it seems to take around 5 minutes per monitor. I hope this helps. otherwise L.E.D.s are sensitive to wavelengths similar to that at which they radiate. Perhaps if you obtain a multimeter and measure the voltage of each led for a given (standardised) setting for each monitor, at least you should have a sort of way to quantitatively compare the brightness/colour balance. Just a thought
If all you have is a hammer, everything looks like a thumb.
> I need to be able to have a bunch of users see the same color on any monitor?
If you wanted to have the _same_ user see the same color the same way on
different monitors, that is theoretically achievable with good quality CRTs,
assuming you can put them in identical settings and so on.
But with different users, there is going to be a difference in perception.
Some people see *significantly* more color depth than others, for instance.
Also, some people's retinas are more sensitive to light than others, so they
have most of their color resolution in the darker ranges; other people have
eyes less sensitive to light and distinguish brighter colors better.
I've discovered that most of my coworkers can't tell #305050 from #294D4A,
even when they're side by side. To me, they're noticeably different in
character, and if you show me one of them by itself, I know which of the
two it is. (This is probably attributable more to the difference in
blue/green balance than the slight variation in brightness, but anyway, I
can tell.) One time I asked for a coworker's opinion on the brightness of
a certain background, and she said it was too dark, so I grabbed the V
slider (in Inkscape) and lightened it up a bit, then looked at her; she
obviously didn't realize I'd changed it at all. So I dragged the slider
over a bit more, and a bit more... after a bit I asked her how that was,
and her response clearly indicated she still didn't see a difference. I'd
changed it by probably 20 or 30 units per channel. (I quit asking for her
opinion on colors after that.) She's an extreme case, obviously, but the
basic phenomenon is universal: people don't all have the same eyes.
Cut that out, or I will ship you to Norilsk in a box.
Get a Pantone compatible monitor calibrator and software.
Like this one.
Not all monitors have the same range of brightness/contrast and colour* gamut (range of colours they can display). If you do achiveve your stated goal, it will only be by making the best monitor you have display the brightness/contrast and gamut of the worst.
Colour perception depends a lot on environmental conditions. On identical perfectly calibrated monitors, colours will not look the same if one is in a room with white walls and the other isn't... and the same goes for one being in a room with flourescent lighting, one being in the shade, one with a window behind it, or one being somewhere there is a pretty sunset happening outside the window.
Users will disagree about the extent of variations caused by environmental conditions, and will disagree about colours. If you do calibrate with the best calibration tool on earth, users will simply not believe that you've done it right, and will resent their monitors being 'wrong' (ie different to the way they were before calibration).
Monitors drift, especially cheap ones... as they warm up, as room temperature varies, and as they get old. Calibration is a neverending job.
* I'm English, from England, and I know how to spell English words. It's not my fault the founding fathers didn't take a decent dictionary to America.
A pizza of radius z and thickness a has a volume of pi z z a
Other posters have gone to great lengths to explain how color perception is environment and beholder dependent. So calibration is of little value. More importantly if you are generating images to be displayed on any users screen, then you have no control over their brightness, contrast, gamma or white balance or the end user's color experience.
But if you want to calibrate a monitor, I can tell you how I used to do it in broadcast.
First you set the black of the monitor: Generate a black screen image. Adjust the cut-off for each color so it just barely illuminates the phosphor. When finished, black is barely perceptable and has no pronounced color.
To calibrate white: Generate a full red screen, 100 hue and brightness, and then use a calibrated light meter to set monitor output to the color temperature of the red component of your final white. Do the same for green and blue. Display an all white screen and see if the screen is proper temperature. Check that the values of black didn't change. Get a feel for where your monitor best performs and run the monitor in a manner that doesn't cause blooming. In other words make sure that the full white value is not beyond the luminance output of your monitor.
Once black and white are correct, display a black and white stairstep signal. If all the channel gammas are correct, the steps should appear even to the eye and all the steps should be grey. If not, the trick is to adjust gamma of the color you don't see to correct the problem. Gamma correction can be very gross and you might not be able to make every step grey.
These steps correct the color balance of a monitor, but you still need to check purity, pin cushioning, convergence, horizontal and vertical linearity before you can be sure that the image on one monitor is the same as the image on another calibrated monitor. I can't image why you would go through this type of trouble.
Of note: The same calibration issues can be applied to audio. Years ago I wired up a new audio system at a recording studio. The studio had done several gold albums including one by the Rolling Stones. All the mics were adjusted to remove bandwidth irregularities. The engineers recorded and set levels for all sessions by listening to the audio from huge JBL speakers set-up with perfectly flat amplifiers. However, when they went to generate the final mix, the did it by listening to the audio through cheap 5 inch speakers. In this manner, they could provide the best listening experience for the majority of users.
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