10 point IRE question

10 point IRE question

Home Forums Calibration Discussion By Brand 10 point IRE question

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  • #156
    Anonymous
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    The other day i calibrated a LG 55LX6500. I did my homework, read the manual, was excited because it was a ISF panel and i really wanted to see what it could do. I got the grayscale almost bang on using the 10 point IRE.

    I had some trouble with the CMS, it was early afternoon by this time and the client didn’t have shades/curtains and 5 big windows *right* beside his tv. After experimenting with CMS, i wasn’t happy with results. As good customer service i told him i would be happy to return in a week when he got shades/curtains installed. (he just moved into his house)

    I wrote down all my settings, was super excited to upload the calibration when i realized i wrote down the 10 point IRE settings. How do i translate that into 2 point settings to upload on the submission page? I do recall switching back and forth a couple of times between 2 point and 10 point IRE, but i don’t recall the 2 point settings changing to reflect the changes i made on the 10 point IRE.

    I realize it’s almost 3am… but am I missing something hehe?

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  • #888
    Anonymous
    Inactive

    all you do is tell us that you used 10 point and don’t worry about it.

    how many point system is the cms in that tv? 18? (nope)

    if not 18 … what was taught about such systems …? They might work and they might not …

    regards

    #886
    Anonymous
    Inactive

    Great, thanks for the quick reply! I’m surprised that the LG didn’t have the 18 controls for CMS, It being ISF certified and all. I thought for sure you’d have the extra controls, i found the 12 controls a little awkward but great experience!

    #880
    Anonymous
    Inactive

    ISF controls mean nothing … in terms of whether they work right or not. The controls are merely provided. Ask anyone about the ISF modes on the Mits RP sets … they exist but things don’t work there.

    It simply means there is a place to store settings … working controls are not a requirement out of this …

    regards

    #883
    Anonymous
    Inactive

    Are 18 working cms controls a requirement for THX certified displays?

    #884
    Anonymous
    Inactive

    No … look at the Panasonic THX units … no CMS … and no CMS needed. With a proper setting of the color control … all color errors are well below 3 … nothing left to do. πŸ™‚

    regards

    #2182
    Anonymous
    Inactive

    What if you adjust colour and tint and the colour errors are not all below 3 and thats the best you can get, does this mean that the calibration is not a valid thx cal even though you hve the best out of the particular screen?

    #2183
    Anonymous
    Inactive

    Still valid … you did the best the tv is capable of …

    you are not supposed to be re-engineering a tv to meet thx certification requirements. That is entirely different than a THX calibration.

    regards

    #2184
    Anonymous
    Inactive

    @Jeff Wolstenholme 2604 wrote:

    Great, thanks for the quick reply! I’m surprised that the LG didn’t have the 18 controls for CMS, It being ISF certified and all. I thought for sure you’d have the extra controls, i found the 12 controls a little awkward but great experience!

    Hi Jeff,

    I don’t know if this will be helpful for you, but I generated a table for Samsung (18 point) CMS controls based on a post by Tom Huffman in AVSForum when I was trying to get a handle on exactly how to adjust color points using a CMS. I thought it was very helpful for adjusting color on Samsung HDTVs. You’ll see the table on the top of the form I use when I’m recording my values during calibration.

    The funny thing is I found I could carry the principles of adjustment over to HDTVs that didn’t have 18 point controls, and it helped me get lower dE’s than I otherwise would. It takes a little bit of practice, but it works pretty well.

    If you’d like to see some of my numbers for an LX6500, PM me and I’ll be happy to pass them along for you along with my calibration report (in case you go back and want to compare with yours).

    So, as you’re learning about this stuff, don’t beat yourself up. Confusion/chaos is the beginning of learning, right? πŸ˜‰

    Hope it helps….

    Best,
    Greg

    #2188
    Anonymous
    Inactive

    Just a point of clarification (this is something I’m trying to get more people to understand)… the original post referred to “10 point IRE”… there is no such thing as IRE in digital video. IRE is an analog video concept that describes the relationship between input voltage and output level of each primary or the white level depending on the context. When we are dealing with digital video we cannot (and are not) dealing with IRE in any way. There are some old timers who refust to stop using it, and it even shows up in places where the software or hardware manufacturer should know better than to keep using IRE when it has a specific meaning that does not apply in the world of digital video. What we deal with in digital video is % white and digital levels 0-255 or 16-235.

    I understand the original post was made at 3am and am not criticizing the original poster in ANY way – especially when IRE shows up in some of the software we use and even in the Lumagen Radiance processors (Jim P agreed that it should probably be changed but I’m sure it’s not very high on the priority list). The problem is that some day, someone may actually be referring to REAL IRE issues/questions and it will get all messed up if whoever he is communicating with thinks IRE and % white are the same thing. They MIGHT be the same thing, but not necessarily.

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