AVS HD 709 - Blu-ray & MP4 Calibration - Page 8

That's right. The lowest setting you can go before 17 disappears is most likely the correct level as long as you can still see the dark gray bars on the 2nd APL pattern also flash. There's an edge on the 2nd pattern that I use to tell when it's flashing.

Some TVs might clip at different levels depending on the APL of the image. DVE HD has pluge patterns on their windows which I suppose is intended to show the effect. We could probably put some dark gray on our window patterns show the same effect, but to this point no one has complained about any problems with using the first pattern for digital TVs and then double checking with the second pattern. My TV doesn't seem to exhibit any changes in where it clips regardless of APL, so any pattern changes in this area would have to be by request.


Someone else would have to address that. I tried to present what seemed some of the best information I've ran across for setting contrast. While I have found the ramp useful for some applications, I haven't used it for contrast.

I agree, so I changed the description a bit to make this link http://www.avsforum.com/avs-vb/showt...0#post12471330 stand out more. Without being able to measure light levels, the first three steps are about the best description I've read.

Encoding is hwjohn's area, and outside of a comparison on that player against DVE HD I really don't have any ideas. To this point the levels have matched between this disk and the others I've measured with my players.

Like mentioned in one of my replies above, I suppose it's possible some displays might clip at different levels depending on APL. Levels can certainly look subjectively different depending on APL, even if they're not being clipped. Without more information I can't say if either might be the case with what you're observing.



I know this sort of thing was requested in the GetGray thread, but I don't know how many people would actually find it useful. With the two SXRDs I've owned, there aren't any controls to make adjustments so it wouldn't really be useful for me. I would like to hear from people that would actually be able to use the pattern because it's certainly creatable, but my impression is that probably only a rather small portion of equipment is actually going to be able to make adjustments from the readings.

The authoring software we're using is rather limited. In order to keep the disk somewhat streamlined so that it's useable, patterns have to be limited. If other inexpensive authoring software was to become available or someone offered to author the disk with better software, that could change. At this time though, I have to be rather selective with what to include and how to include it. What you're suggesting is 60 patterns, which is a lot in comparison to the current disk size. While I might choose to include a full set of 10% grayscale and 75% color fields, generally I'm not convinced that fields are widely useful. Many TVs also only actually produce primaries, so even if I went with windows I don't know that I would include secondaries.