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Author Topic: Dell U2410 calibration  (Read 162911 times)
Adam
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« Reply #75 on: May 04, 2010, 09:25:31 AM »

There is nothing to verify, because your results are false in the first place.
you need correction matrix or spectrophotometer device. The colorimeter wont do.
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Terry-M
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« Reply #76 on: May 04, 2010, 10:17:26 AM »

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you need correction matrix or spectrophotometer device
So you also need a means of calibrating the spectro' against a traceable "standard" and check it at regular intervals. Don't tell me about the principals of calibration, I was a professional at it.
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The colorimeter wont do
.... needs numbers to say what won't do. Have you ever seen the "Uncertainty" of measurement" values for any monitor calibration device, this is more than just "accuracy".

Well, a lot of colorimeter devices are sold and many pro's and advanced amateur photographers use them.
You can become too fussy on these matters especially as colour is a matter of perception for most photographers and I know, from my supplier who is a graphics industry expert, that devices like the EyeOne 2 display are perfectly adequate for most purposes. This particularly applies with monitors that do not have hardware calibration.

Roma already has the EyeOne 2 Display device and what seems to be a "modest" monitor so let's help him with what he has got!

For the record, about "validation" (not verification)
Validation merely gives the dE2000 errors for the current monitor icc profile using the same device as was used for the calibration. These dE2000 errors, in simple terms,  are a measure of out-of-gamut amount of the monitor in relation to the test colour patches. A value is given for each patch and an average.
It has nothing to do with the accuracy of the measuring device but does give an indication of the monitor gamut in relation to the test patches.

Terry.
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Adam
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« Reply #77 on: May 05, 2010, 01:44:45 AM »

Think about it...
What the Munki will allow you to do is to get a more accurate calibration and profile, because it will not suffer from the effects of a wide-gamut screen like a colorimeter (e.g.  dtp94 measures a certain color temperature, say 6500K, the real value may be several 100K off for wide-gamut unless the values are corrected. Same for the primaries and other colors). Please note that this increase of 'absolute' accuracy will NOT show in things like profile verification/validation results, because a profile built from one set of (wrong) measurements from a colorimeter and wide-gamut screen will also verify good against another set of (wrong) measurements of the same colorimeter and screen (if the screen parameters are the same and it hasn't drifted much).
It's sort of like blind leading blind.
It just cannot be done with colorimeter without corrective matrix.
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Terry-M
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« Reply #78 on: May 05, 2010, 07:36:05 AM »

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It's sort of like blind leading blind.
Yes, the whole idea of using the device that produced the profile to check the profile is flawed.
However, the proof is in the pudding, I get excellent monitor to print matching which is, in the end, what matters.
When someone invents a printing system with a gamut approaching that of a monitor, then the finer points of calibration may become more relevant, but I don't see that happening just yet.
Terry.
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ChasP505
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« Reply #79 on: May 05, 2010, 03:19:51 PM »

It's sort of like blind leading blind.

I see it more as the device patting itself on the back for doing such a good job for such a low purchase price.
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Chas
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