Question regarding bt1886 (oh no - I know).
Just watched Episode 208 of Home Theatre Geeks to get more clarification regarding the bt1886 spec and found that most people even talking about it are bafoons (sic?), including even the types that write the spec...
When Joel Silver talked to TV manufactures he acknowledges that bt1886 is "too dark for lit room viewing" but it would be nice of them to implement it in a "nighttime mode".
When talking about his own setup Joel Silver mentions that he uses bt1886 ONLY in dark room conditions.
When comparing bt1886 to power gamma - Joel Silver is "happy that bt1886 is a FIXED curve" - as in "there is only one".
When talking about post processing environments he mentions that power 2.35 was used on certain CRTs (but that there is a huge variety).
When talking about projector calibration he mentions that his calibrators always shoot for at least 100cd/m2 (whitepoint).
When talking about the de facto post standards in studios that use bias lighting - he mentions that they use a white point of 120cd/m2 even for mastering.
Then he anecdotally talks about experimenting with customers, setting their home theatre rooms to 140cd/m2 and them "loving it".
So inside those statements there are at least 3 contradictions/errors of high magnitude.
For now I have but one question for zoyd, if you have the time. HCFR supports (and now defaults) bt1886. The bt1886 formula orients itself on the black point and the white point of the display you are calibrating?
Therefore the bt1886 curve can start at a gamma of lets say 1.9 (lowest point) > upon which it would be suitable for lit room viewing (blacks very visible).
But that in return invalidates the entire reason this standard is pushed upon > mimicking dark room mastering.
edit: From the ITU suggestion paper I collect that their argument for implementation is mostly "historical accuracy" to some standard "that wasn't accurate at all". At which point it becomes a mere matter of preference (there ought to be a standard, but which should the standard defining body pick?).
I also still have the question regarding the huge potential variability of the niveau of the curve (up, down) as seen in HCFR. How much of it is depending on the white point, how much of it is dependent on the black point (is the ITU suggesting two formulas should be used dependent on the black point?) (edit: Here is me trying to apply logic - the answer is "it depends" because black and white are both the (individually different) "pseudo" end points of the (greater) curve (which is always the same?)). Can there be a general statement for which "viewing environment" bt1886 aims - at all? Wasnt part of the original intention that the curve would be fixed (as in "set in stone, not movable at all").
Last edited by harlekin; Today at 08:56 AM.