Radiance 3D LUT (5x5x5 Cube) Calibration with CalMAN 5 - Page 11

I will look for that setting, thanks.

UPDATE:
Yes you are correct that was my problem, working like a champ now.

ss
Edited by sillysally - 10/2/12 at 6:24am

Redo the cube calibration with few different parameters. First, I set the projector to output at PC level so that it will pass BTB and WTW. Then black is set to clip at 16 and white at 245 (to allow some buffer for cube calibration). Gamma is set to BT.1886. The result although better dark details but cause too much banding in dark scene. I'll try another set of calibration with power 2.2 gamma to compare.

I went through the entire process and the image looks amazing except that the image is darker. Following the CalMan5 workflow, my contrast/brightness were fine at the beginning but at the end (after running 3D LUT), they're not. Am I supposed to go back and fix the brightness and contrast?

Yes a click or two of brightness and contrast will up your dE's for cube a somewhere between 0.1-0.5 dE, not enough to worry about, and getting black level right is much more important.

Just making sure, does the Cube calibration automatically store in my Mini and does it over write the last stored calibration?

Will the reset button in the Lumagen 3D LUT drop down reset (delete) the stored calibration in my Mini.

For both questions, say I am using the same Config/CMS 0

ss

Yes CalMAN automatically saves the LUT as it's created.
Yes resetting the LUT inside CalMAN will overwrite the LUT in the radiance.

Obviously you can switch the CMS inside CalMAN if your intention is to use different LUTs.

for an Autocal of a rear projection TV, should I set the window size of the Lumagen test patterns to large, small or does it not matter ?

Thanks.

- M

window size shouldn't matter for a dILA or DLP rear-projection setup ( I might even use full screen patterns), rear projection CRT, I'd use small.

thanks, sotti

just for my clarification as some members here have stated other things:

Is it better to pre-calibrate a display in combination with the Lumagen or should I use a display with the factory defaults (some members have stated that) ?

The current RPTV I'm using the Lumagen on has been previously calibrated using Calman and it makes sense to me to start off with that as the signal will be less distorted by the Lumagen...

That depends entirely on the display.

You see posts about projectors like the JVC where using the cuts create issues with the CMS.
I have a toshiba that has posterization issues with the luminance control in it's CMS.

The least amount of processing you can do externally the better, but some external processors do a much better job than displays. I wish there was a universal answer, but unfortunately it is display to display.

thanks, well I can always do 2 color cubes one with the current calibration and one with the factory settings... good thing autocal doesn't take along and doesn't require interaction... ;-)

Does the Lumagen Mini have a cube memory per input or just one cube for both inputs?

1 per CMS slot, which I believe there are 8.

I took my first stab at the 5x5x5 matrix cal tonight.

I'm using v5 Ultimate 5.0.2.903
Radiance is an XE 3D with 091512 firmware (most recent on the Lumagen site)

I don't have a "Color Cube" workflow... I have an SI Studio Pro workflow. Is that what I should be using for LUT cals?
Edited by Doug Blackburn - 10/4/12 at 12:26am

I'd recommend using the latest Cube workflow.

Grab the latest Business RC from this post.
http://www.spectracal.com/forum/viewtopic.php?f=92&t=4121

Alternatively you can build your own Cube Calibration Layout. The only real requirements would be going into the properties for the layout and checking the "Interactive" checkbox. Then updating the AutoCal Button to use the command "DISPLAYACTION.SETALLCUBE".

But honestly the Cube Workflow is great for going through the process in the correct order.

I can't seem to find the correct setting to get the Color Cube LUT calibration started (Step 3)...

I'm in the Color Cube 3D LUT workflow, just finished Step 2 "Pre-Characterize Display" (all values pass) and when I click on the CALIBRATE CUBE LUT button the template jumps directly to Step 4, which I think is the 1D ramps...

Here's what I got configured:

Meter Settings Dialog Box: i1D3 using an i1Pro profile

Source Settings: Lumagen Radiance Series

Display Control: Lumagen Radiance Series 3D LUT - Config / CMS 0

Why is it skipping Step 3 ?


One things is odd though, under Step 1 in the Color Cube template > Image Processor Setup > I selected "Lumagen Radiance 3D LUT fw 090412 or later (RS-232)" but I cannot specify a 3D LUT memory slot...


Thanks.

- M

Step 3 is to get your display itself close enough to be use the cube calibration. If your display is way way off, you'd need to set it up correctly first.

After you connect, you can go back to the display tab to select the CMS you want to calibrate.

ahhh, Step 3 is optional... I was getting paranoid here...

Thank You for always posting about the Radiance updates.

ss

alright, ran my first full 125 point Autocal using Calman 5 Enthusiast and got some feedback:

* first of all congratulations, the new interface is much cleaner and much more organized

* software crashed when trying to generate the HT report Step 5 in the Color Cube workflow... report was sent to Spectracal

--> re-loaded the calibration session, the HT report is still not working fully (color points not shown in gamut / delta E 2000 color graph empty)

--> initiating a studio report did work: Calman 5 > Open Report Template > Studio Report.... but the dE numbers in the studio report slightly differed from what was displayed in point (6.) Advanced 3D Analysis > View 3D Analysis says... are these different dE formulas ? it appears both values are dE2000...

* is there a way to open up new windows and get more data out of sections like it was possible in Calman 4 ? I know that I can change some values in the pre-defined windows through the properties dialog box but would like to see much more data...

* is there a detailed report available including dE 76 / 94 / 2000 for the pre and post calibration state of the display ?

* i1Pro got unintentionally disconnected from PC after a profile was created - plugged it back in, wanted to create another spectro profile and the sw thought the i1Pro was still connected and did not ask for for an initial dark reading... it triggered a straight reading and the sw broke with error that light output exceeded the limit of the spectro and could damage the spectro... would be great if sw would keep track of connected / disconnected devices...

* I saved a calibration sessions and gave it a specific name but when I load calibrations, I do not see that name - I see the standard name for all of my saved sessions

* I can't delete any saved calibration sessions

- M
Edited by Iron Mike - 10/4/12 at 6:00am

I use a i1pro2 and have a question about how it intergrates with the lumagen/cube calibration.

On a Panasonic 65VT50, the 10% grayscale reading bounces around to the degree that it's pretty much useless in a manual calibration. I'll be using a different meter for 10% if I want that accurate.

I understand that 10% will be different for different displays but on the 65VT50, it's pretty dark.

How can cube calibration work at 10%? Isn't that a problem or do we just figure that when it's that dark, it doesn't matter that much?

Well the cube only works on 25% increments, so 25% blue is the darkest thing you'll read during the calibration. Another thing to note is that the i1 Pro 2 the total amount of spectral energy for blue fairly similar to just red or just green. The meter measures watts of energy per steradian, per nanometer of wavelength. So even though green contains more visual energy so more luminance, the amount of actual energy is very different on individual primary reads.

Beyond the physics of reading the light, CalMAN 5 has a tuneable low light handler that helps considerable for repeatability at low light. But typically we'd recommend going one step further and profiling a colorimeter to your i1 Pro2. That way you'll get the accuracy of the i1 Pro 2 + the low light sensitivity of the colorimeter.

Thanks Joel.

Good talking to you yesterday.

Maybe did you talk to Loel Wheeler?

I was nose in my keyboard all day yesterday.

Jim here is a auto 3D LUT workflow 21 point gray scale i ran today, using my I1pro2 and my Mini. I didn't touch it up so what you are seeing is default settings, run in auto mode..



ss

If you wish to receive updates of the firmware within 24 hours sign up here:

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just enter the URL of the specific page (whether it's XD, XS, Mini, whatever) and you won't miss an update.

I know it's been mentioned, but I can't find it. My Lumagen/C6/CalMAN package just arrived a day early (yay!). What is the best setting to start from on my RS20? Get it as close as possible without taking away gamut that the calibration might need? This may help with banding as I remember from somewhere. Or, just give the Lumagen all the flexibility it needs by setting the RS20 at its native wide color gamut, letting the Lumagen winnow away the colors as it needs to?