Originally Posted by sotti
Yes if you want a perfect calibration, you might loose 2-3 cd/m...
Hi Joel and Derek,
I am interested in purchasing Calman 5 Enthusiast and have many detailed questions I'm hoping you can help with:
1) Regarding Joel's comments about brightness quoted above - this is a great concern for me, as it is other members who have voiced opinions about it. I want the 3D color cube, but do not want to sacrifice much light in the process. I read some of your later posts that said you anticipated making some changes that would lower your overhead/buffer to eek out more brightness - was that successful and how much more brightness?
In another post you mentioned if we really really don't want to lose brightness would could change some targets, but I did not understand that explanation. Can you elaborate?
Also - I have a VW95 and have previously measured its Wide color space. In this mode there is enough Y for all 6 colors. Does this mean you would not lower brightness? Or does it just mean that you will not have to lower it as much (lowering it to give you a buffer etc)?
2) I tried the software in evaluation mode with the simulated meter. I realize from other posts that to get the 3D color cube going you must choose it instead of regular CMS. However I searched high and low and couldn't find any option for the color cube. Using the Enthusiast workflow it did not offer a 3D cube either, just regular CMS. Am I missing something here, or are these options not presented because I am in evaluation mode and need to be connected to a Radiance for those options to even be shown?
3) I saw in a post where one of you recommended trying the auto-calibration in simulation mode to get a feel for how it works. But when I try it says its not available in evaluation mode?
4) I have an Eye One Pro that's about 9 years old and hasn't been calibrated/tuned from X-Rite, and an i1D3. Given that I am not going to calibrate the Eye One Pro, would you say that the i1D3 is likely to be more accurate and I should use that? Or would you still recommend training my i1D3 to the Eye One Pro?
5) I'm confused about the meter training option. I want the reference meter to be the i1D3 off the screen with diffuser off, and the target meter (the one I will do the calibration with) to be the i1D3 facing the projector lens with diffuser on. On the Create Profile would I just have the i1D3 selected as both the reference and target meter at the top, and then at the bottom for Display Type choose LCoS Front Projector (facing projector)? Is this all that is needed?
One thing that's confusing is that at the top of that screen - if I choose Advanced options, under the Reference Meter it gives me a Meter Mode where you can choose front or screen facing. But for the Target Meter selection it does not. Why is that?
Once the profile is created/measured you just select it from the Meter screen and it is automatically used? There does not appear to be any indication in the GUI besides that selector that a trained meter is in use?
6) For the i1D3 is there an option in the software where we can tell Calman whether the diffuser is on or not? Is this necessary?
7) A trick I use with the Radiance and my VW95 is to use a small bump of 0.3 IRE at 0% in its 21pt calibration. This makes it so my level 17 is barely visible (brightness control on the pj is too coarse). If I make the change manually in the Radiance, will the auto-calibration clobber it? Or is there a way I can tell Calman to set it at that and not touch it?
8) The VW95 does not provide the ability to put the pj into 0-255 vs 16-235 mode (like the JVC line does). Instead it auto detects the levels based on the Radiance. I have the Radiance set to output YCrCb 4:2:2 Video. Is this setting ok when working with Calman?
9) Talk about measuring and calibrating with headroom up to 255 has me nervous. It may be the gold-standard recommendation, but in my case I want to clip at 235. IMO the headroom up to 255 not worth the tradeoff in brightness. I don't want to debate this with folks because I understand their reasoning and they are entitled to their view as am I. I only bring it up because I want to make sure that if I use auto cal for grayscale/gamma and/or CMS/cubed its not going to dim me for this headroom. Is there a setting where I tell it this is my preference?
10) I'm not familiar with dE2000, but am a bit familiar with dE94. Am I correct to assume that dE2000 takes Y into account? For example, as I understand it with dE94 your color may be a fair amount off at 5% yet it is so relatively dark that the color error is not really perceivable, and therefore you can still wind up with an excellent dE value. dE 2000 works the same way? With dE94 I had always heard to target 1.5 or lower - that anything at those levels is indistinguishable by eye to the standard. Is 1.5 the same threshold for dE2000? I ask because the charts seem to be forgiving (green) up to 3.0.
Thanks and I look forward to your responses!