Originally Posted by sanderdvd
I honestly have to say that I cannot really see any difference when viewing real-life content and switching between the first and second calibration I did. I will leave it on the second because for my own feeling gamma is more inportant then the (small) difference in greyscale.
I do the CMS calibration tonight and will report back the results here.
I do miss the 11 point gamma system from the previous models now! I could easily fix the 20IRE gamma peak and move the 60 and 70IRE a little upwards. With this current 3band system this is not possible. the middle band has a lot of affect on 20-80IRE and this makes it not possible to fix the 20IRE peak for example because when I do the the 60 and 70IRE will be too low.
btw: you read a lot of comments about making sure 20 and 80IRE have a flat greyscale but I find it far more important to have a good greyscale at 10 and 100IRE. I want snow to be absolutely WHITE in movies and harry potter scenes BLACK and not BLUEblack or GREENblack.
Yes, we all think these gamma controls are a step back, still they are better than no gamma controls at all, as you have experienced if you compare the results you got without using them at all and only using the 2 point greyscale controls.
I wouldn't obsess with the small errors you have in the second calibration, it's about as good as you can get with the internal controls, if you want better you need a Radiance or similar now that the 11 point gamma controls are gone in the JVCs.
Don't waste any time with the JVC CMS, like with previous models it is useless if you target rec 709 at 100% saturation. The problem has been reported every year and JVC clearly has no intention of fixing it (or maybe they are not capable of fixing it). You'll be able to get all your primaries and secondaries within 1-2 dEs at 100% saturation and a very nice looking graph but the calibration will be undersaturated because all the points at 75% saturation and below will not track anymore and will likely be significantly undersaturated.
If you really want to lose some hair (you can get decent results with the internal CMS but it takes time and experience), my advice is to not use the saturation controls at all in the CMS and to try to get each colour as close as possible using mostly hue and brightness, or make minimal use of the saturation control if necessary, but you need to look at all saturation levels to get the best compromise, not just one. Targeting any single level to rec-709 will get you one level right and all other levels wrong and the "corrected" picture will likely look significantly worse than the uncorrected one (visibly undersaturated if you adjust 100% sat to rec 709). Ever wondered why most reviewers never show the saturations charts after their "perfect" calibration using the internal JVC CMS?
Targeting 75% of rec709 - we're talking saturation, not luminance - might help (chromapure has the option, like most other calibration software) but honestly the standard colour profile is good enough and best left untouched (it tracks saturations pretty well if you don't use the CMS to "correct" it). Unlike the first JVC models, recent models give very decent gamut performance using the standard colour profile, and the majority of users will be very happy with the colour accuracy the standard profile provides, without any need to use the CMS. Gamma/greyscale is much more important to get right on these models IMHO, as this is where most of the picture improvement will come from after a good calibration
If you really want better results, forget the internal JVC CMS (it's an outdated tool anyway) and get a processor which gives you a 3D LUT like an eecolor (65x65x65 LUT and very cheap, but only if you don't care about 3D blurays as it won't pass them through and if you have no video processing need as it's just a LUT holder) or a Radiance to get a 5x5x5, 9x9x9 or 17x17x17 LUT depending on the model and a full array of VP features as well. The Radiance line is fully supported by Chromapure but not the eecolor as far as I know, so you might need to use ArgyllCMS or Calman to generate the eecolor 3D LUT.
If your main source is an HTPC, you can get stellar results (as good as an eecolor) using MadVR with any software player supporting it (using ArgyllCMS to generate the 3D LUT) but at the moment you lose full BD Menus and 3D Blurays as no licensed player supports MadVR (yet) as a renderer, or directly supports a 3D LUT.
By the way I'm still replying because no one has complained - yet
- but I really think you should start a calibration thread if you want to take this further because most of this advanced calibration talk is OT for most users.