Quote:
Originally Posted by
Doug Blackburn 
I'm trying to work through a Cube calibration following the new sequence with 5.0.3.9whatever and a Radiance XE 3D processor. The Cube workflow defaults to dE2000 so I left it there. When I autocal with 21-steps, the grayscale dEs are 1.5 or lower. When I do the Cube CMS cal, the dEs are 2 or lower. Thinking everything was fine, I quit CalMAN 5 and on the way out it sets the Radiance to the 21-step ramp pattern. I was very surprised to see visible color in some of the steps... a green-tinted step at 85$, orange at 50%, magenta at 35%, etc. I'd say about 12 or 13 of the 21 steps look neutral while the others have colot tints that are visible in the 21 step ramp pattern. The visiblility of the color tints in the ramp pattern isnt't awful, but they aren't difficult to see - they are certainly more obvious than 'just barely noticeable' but not terrible. The colors in some of the steps is far more obvious than the dE2000 error numbers (1.5 or less) would lead you to believe.
Is there something about dE2000 that leads to these issues? Should I be using a different dE? I normally use dEuv for grayscale. If I change to dEuv, will that change the way the grayscale auto-calibration is done? In otherwords, will dEuv errors become the "new standard" for the grayscale autocal?
No you shouldn't be seeing visible errors, my guess is if you remeasured you'd see larger errors that would indicate there is an issue.
Also you can flip back and forth between dEuv and dE2000 in the chart. You will undoubtly see 5-15% have higher dEuv, but their should be minimal difference in the dEuv and dE2000 for 50% up.
In other words the problem you saw was unrelated to dE formula.
Quote:
Originally Posted by
Doug Blackburn 
can make the steps that have visible color tints look neutral if I manually tweak the grayscale but I need an easier way to make 0.1 adjustments to the DDC controls... the + and - signs make changes or .3 or .4. But I need a resolution of "0.1" in order to make the ramp pattern steps all look neutral. I can do that by dragging the DDC slider, but it's VERY jumpy. Is there some easier, more precise way to adjust DDC controls in 0.1 increments?
The next update, not todays, will have 0.1 increment steps for the incrementers. Also todays update did make some other adjustments to the usability of the DDC controls. Personally I use the text entry method.
Quote:
Originally Posted by
Doug Blackburn 
If I don't notice the tints in the grayscale steps until AFTER the Color CUBE CMS was done, I presume I would have to Reset the Cube from the DDC window before going back to tweak the grayscale adjustments? And once I was happy with the grayscale adjustments (confirm no visible color in any of the 21 steps), I could then do the Color CUBE autocal. Is that right?
That's about right, you might be able to tweak after the cube is done, but the steps won't always line up so a 75% pattern after it comes out of the cube might only be 72% going into the grayscale controls so you'd be in a situation where both the 70% and 75% control have equal effect over the pattern.
Quote:
Originally Posted by
Doug Blackburn 
Is it possible that once I have the grayscale steps all looking neutral and I run the color CUBE CMS then view the 21-step ramp again that I could see some steps with a color tint? If that happens, is there a way to fix the grayscale to remove the color tints?
Early lumagen cube firmwares had serious issues with this. Make sure you are running the latest firmware. The interpolation effect on grayscale has been minimal for the last several builds.
Quote:
Originally Posted by
Doug Blackburn 
I notice when doing the grayscale autocal, some of the messages I was seeing on-screen (wish I'd written them down, but I didn't) refer to the cube or matrix calibration. What's up with that? What does that mean in terms of what I can or can't do manually to fix problems the autocal leaves behind?
I'm not sure exactly what you saw, but the messages you get during the autocal are all just status messages describing the procedure (as long as you get a completed successfully popup at the end).
Quote:
Originally Posted by
Doug Blackburn 
While waiting for some new panel display to show up for review, I'm working with a 2008 Samsung plasma. Is it normal to see 109% white fall off the orange guide line when you are using the workflow page (not in Cube, I think it was somewhere else) that has steps of 90%, 100%, 109% and several more between 100 and 109. The CalMAN/Radiance combo is sending fairly small window patterns... I guess I never checked 100%-109% on a plasma before to notice if the luminance limiting plasmas do is measurable with small window patterns. I do not see one particular color fall off as you'd expect if one of the colors was "running out of gas" at the brightest steps... all 3 primaries remain parallel to each other,but the lines they make aboive 100% have slightly less slope that the orange line that indicates ideal luminance (2.2 gamma target for this panel).
I think that's all the questions so far - the time investment in v5 is starting to get significant so I need to get to the point where this new calibration method starts to sink in -- thanks in advance for any insights that will help accelerate the learning curve.
It's totally normal to get a little droop as it runs out of steam going to 109%, as long as the lines are tracking in parallel you aren't getting a color shift so it's too big of a deal if they are off gamma by a bit. In fact I believe we have a DeltaL chart underneath to show precisely how much luminance error is being measured.