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Author Topic: Monitor Profiling -New Products**  (Read 21339 times)

digitaldog

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« Reply #40 on: October 13, 2006, 09:48:06 AM »

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Now we'll all have customers thinking L* doesn't work which is silly. [a href=\"index.php?act=findpost&pid=80207\"][{POST_SNAPBACK}][/a]

I never said anything to give customers that impression? You're very sensitive.

To Jack's customers. I have nothing against L* nor think it doesn't work. Jacks older shiny bridge is stable to walk or drive across.

Karl is working on getting some information about the new CIECAM stuff which if it's OK with Jack, I'll post as soon as I hear anything.
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Andrew Rodney
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Mark D Segal

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« Reply #41 on: October 13, 2006, 10:00:51 AM »

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I never said anything to give customers that impression? You're very sensitive.

To Jack's customers. I have nothing against L* nor think it doesn't work. Jacks older shiny bridge is stable to walk or drive across.

Karl is working on getting some information about the new CIECAM stuff which if it's OK with Jack, I'll post as soon as I hear anything.
[a href=\"index.php?act=findpost&pid=80217\"][{POST_SNAPBACK}][/a]

Andrew I have only two comments about this sarcasm:

(1) If a bridge is shiny and gets me from point A to Point B I don't care how old it is. When a DEMONSTRABLY better mouse-trap comes along that gives me better still, I'm all for it.

(2) Instead of being a post-office for Karl, why don't you put your own value-added into this by doing comparative testing once CIECAM is in a final version so you can then advise people first-hand about what has been accomplished in a comparative sense. That is the kind of thing your readers would expect of you, respect you for and find more useful.
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Mark D Segal (formerly MarkDS)
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digitaldog

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« Reply #42 on: October 13, 2006, 10:05:54 AM »

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Andrew I have only two comments about this sarcasm:

Only two? Jack?

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(1) If a bridge is shiny and gets me from point A to Point B I don't care how old it is. When a DEMONSTRABLY better mouse-trap comes along that gives me better still, I'm all for it.

We can attribute the Bridge comments back to the salesman (Jack). I'm only bouncing his comment back in context.

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(2) Instead of being a post-office for Karl, why don't you put your own value-added into this by doing comparative testing once CIECAM is in a final version so you can then advise people first-hand about what has been accomplished in a comparative sense.

That's my intent. And since there are other beta testers commenting here AND it's OK with Karl (I wasn't asked to sign an NDA, he asked for folks on a public forum to email him for the beta), there's nothing wrong with us discussing this product. In fact, until Jack showed up, we WERE on topic. I suggest we continue please.
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Andrew Rodney
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digitaldog

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« Reply #43 on: October 13, 2006, 10:43:09 AM »

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Karl is working on getting some information about the new CIECAM stuff which if it's OK with Jack, I'll post as soon as I hear anything.
[a href=\"index.php?act=findpost&pid=80217\"][{POST_SNAPBACK}][/a]

Here's a start

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L* calibration is based on a linear relation between RGB values and 
monitor luminance in L*(a*b*)
CIECAM02 calibration takes some other factors of human vision into 
account, the most important of which (in our implementation) is the 
ambient light in the viewer´s environment. So far, we have 3 discrete 
steps, "dark" which is up to 32 lx, "dim" 32 - 64 lx and "average" 
which is > 64 lx. The release version will have the option to measure 
ambient light in order to define the correct setting. The calculation 
of the calibration curves is being calculated with the CIECAM02 
algorithms.
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Andrew Rodney
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ato

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« Reply #44 on: October 13, 2006, 11:05:06 AM »

will the "new CIECAM stuff" reproduce a better shadow as L*??
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standard_observer

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« Reply #45 on: October 14, 2006, 02:42:55 PM »

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Here's a start
>> The release version will have the option to measure ambient light in order to define the correct setting. The calculation of the calibration curves is being calculated with the CIECAM02 algorithms. <<
Could it be that CIECAM02 calibration will produce a difference between the calibrated & measured tone curve and the TRC tag of the resulting monitor profile?  Thus, applying a visually effective tonal boost on the shadows, like with a tone curve in PS, rather than being a purely descriptive approach for the calibrated state?

Anyway, I would also be pleased to learn which of the newer products offers the setting ‘Native gamma’, or, allows to upload the TRC tag from any icc profile as the target for calibration (like with old optical 3.7.8)?

Thanks!

--
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digitaldog

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« Reply #46 on: October 14, 2006, 07:10:22 PM »

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Anyway, I would also be pleased to learn which of the newer products offers the setting ‘Native gamma’, or, allows to upload the TRC tag from any icc profile as the target for calibration (like with old optical 3.7.8)?
--
[a href=\"index.php?act=findpost&pid=80388\"][{POST_SNAPBACK}][/a]

EyeOne Match supports Native Gamma in the last version. The BasICColor product being discussed does too.
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Andrew Rodney
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standard_observer

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« Reply #47 on: October 16, 2006, 08:54:40 AM »

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EyeOne Match supports Native Gamma in the last version. The BasICColor product being discussed does too.
That’s good to hear.

For me the basic question is:  why should I want to calibrate away from the native gamma, or any suited target curve closest to this native state?  Given that it’s desirable to avoid any work for the video card.  And further given that any ‘gamma’ is invisible in an icc-aware application…

However, I see that this is probably the wrong thread to go further into this subject
- though your comments are always appreciated !

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digitaldog

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« Reply #48 on: October 16, 2006, 09:26:30 AM »

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However, I see that this is probably the wrong thread to go further into this subject
- though your comments are always appreciated !
[a href=\"index.php?act=findpost&pid=80658\"][{POST_SNAPBACK}][/a]

On an LCD, you want it whenever possible. But do a search as this has been discussed here in detail.
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Andrew Rodney
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Dinarius

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« Reply #49 on: November 01, 2006, 01:15:20 PM »

Slightly off topic..............but.........

I use PC. I know zip about Macs.

I want to calibrate a friend's desktop iMac.

Is it possible to adjust brightness, contrast and RGB channels seperately?

If so, where are they to be found.

Thanks.

D.

Needless to say, he knows less about Macs than I do! ;-)
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61Dynamic

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« Reply #50 on: November 01, 2006, 01:34:16 PM »

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Slightly off topic..............but.........

I use PC. I know zip about Macs.

I want to calibrate a friend's desktop iMac.

Is it possible to adjust brightness, contrast and RGB channels seperately?
[a href=\"index.php?act=findpost&pid=83255\"][{POST_SNAPBACK}][/a]

On an iMac, no. It would be like the ACD displays where only brightness is adjustable; just as it should be.

The iMacs, just like the ACD displays are able to dim to 95cd/m2, well below the optimum luminance.
« Last Edit: November 01, 2006, 01:35:10 PM by 61Dynamic »
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Dinarius

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« Reply #51 on: November 01, 2006, 02:04:07 PM »

Daniel,

Thanks for that.

1. He actually has a couple of iMacs. Not being able to find any controls, I ran Eye-One Match on Easy mode. At the end, one Mac had Gamma 2.2./7300K/132Lum. The other was 2.8/6800/92.

Presumably, there's not much I can do to bring them closer together?

2. If I can persuade him to buy another Mac for imaging only, which of them is fully adjustable?

Many thanks.

D.
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opgr

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« Reply #52 on: November 01, 2006, 02:21:37 PM »

The monitor should easily be adjustable. Either use the sunny-symbol keys (F1, F2 ?) or go to the Apple Menu -> System Prefs -> Monitor Panel and adjust the slider accordingly. I prefer the sunny symbol keys as they allow a stepped setting. This way you can reduce the brightness whenever useful and return to a known brightness state whenever critical.

The gamma difference seems rather excessive. You may also want to check whether the Universal Access is switched off. Universal Access has a short cut for monitor contrast which happened to conveniently(not!) co-incide with some Photoshop shortcut. Therefore some people would find their monitor state changed after using photoshop or even get a calibration error.

Universal Access can be switched off in Apple Menu -> System Prefs -> Keyboard & Mouse. Go to the Keyboard Shortcuts tab and switch off Universal Access.

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Daniel,

Thanks for that.

1. He actually has a couple of iMacs. Not being able to find any controls, I ran Eye-One Match on Easy mode. At the end, one Mac had Gamma 2.2./7300K/132Lum. The other was 2.8/6800/92.

Presumably, there's not much I can do to bring them closer together?

2. If I can persuade him to buy another Mac for imaging only, which of them is fully adjustable?

Many thanks.

D.
[a href=\"index.php?act=findpost&pid=83265\"][{POST_SNAPBACK}][/a]
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Regards,
Oscar Rysdyk
theimagingfactory

61Dynamic

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« Reply #53 on: November 01, 2006, 07:38:21 PM »

Dinarius,

Don't calibrate in Easy Mode. Use advanced and set things at specifically 6500K/2.2 or Native WP/Gama depending on his needs.

The imacs should have touch-senitive controls on the side or back (I'm thinking of newer models, don't know about the swivel-head or half-egg variety) for brightness from what I remember. Using the keyboard isn't as accurate for setting brightness as the touch-controls (don't know about laptops which seems to be what OPGR is thinking of. F14 and F15 are for brightness adjustment on non-laptops).
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jackbingham

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« Reply #54 on: November 10, 2006, 09:00:58 AM »

A couple of comments. From research I have been given from ICS it appears that L* might well be required in order to make ciecam2 work properly. Having a linear base to build on seems to be at the core of making ciecam produce the results it promises. Second, ciecam really comes into play when considering not just the monitor profile but critical viewing conditions. So while it may well promise a new day in accuracy all users will need to upgrade their viewing environments to get the benefit. We're not just talking about a display profile here. Viewing booths, paint colors, ambient light levels........... Therein lies the shiny new bridge.
As for native white point and gamma, I think this point is being driven by the most technical among us and does not necessarily apply to the bulk of users. Secondly LCDs with high bit internal luts make the native white point argument mute since there is no correction being applied in the video lut. For many monitors this is also true for tone curves. Certainly there are monitors that are sold as high end imaging displays that should have internal controls in order to meet that description, that do not. And native gamma and white point for these may be the only way.
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Jack Bingham
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digitaldog

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« Reply #55 on: November 10, 2006, 09:55:29 AM »

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Second, ciecam really comes into play when considering not just the monitor profile but critical viewing conditions. So while it may well promise a new day in accuracy all users will need to upgrade their viewing environments to get the benefit. We're not just talking about a display profile here. Viewing booths, paint colors, ambient light levels........... Therein lies the shiny new bridge.

Ciecam or not, those should always be bridges users should consider for best screen to print matching. You can have a $20K spectroradiometer and anyone's best software product and if you don't have viewing conditions nailed, you're not going to get optimal screen to print marching. It will NEVER be anything close to 100% anyway. If you get the mid 90% range, fantastic. When we work with prints that emit light, lets talk. Otherwise, just the huge gamut mismatch in display versus output, the differences in dynamic range of the two (and the poor tools we have to soft proof paper white in an image editor) make this even more difficult.

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As for native white point and gamma, I think this point is being driven by the most technical among us and does not necessarily apply to the bulk of users.

Only if you don't care about the degree of data loss and banding on most LCDs.

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Secondly LCDs with high bit internal luts make the native white point argument mute since there is no correction being applied in the video lut.

It's still an 8-bit system in and out. We don't have the OS level and hardware level support for true high bit viewing. 8-bit to 12 bit to 8-bit is mildly useful. It's much more useful if you sell displays!
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Andrew Rodney
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