Originally Posted by kyun7128
Please forgive my extreme ignorance but I don't know what you mean by the vertical bars. My only experience is with the standard test screens on DVE with the 4 boxes in the middle and the 3 vertical bar on either side. I have seen a large number of vertical bars on the THX calibration screen and I wonder if that is what you are talking about.
I know how to use the test basic test screen on DVE for setting black...it's just that I'm wondering if it is better to set black level a bit higher to bring out more detail. If so, I'm trying to figure out how high to go. If you have a better test screen I should use or even a screenshot, I would really appreciate it.
When setting white level, I cannot get the white box to bloom...rather, it won't bloom with a digital display so even when set to max., it still looks okay. What is the best or correct way to set white level?
Thanks for any advice.
The vertical bar test pattern was actually specially created by someone on the HTPC/Display Calibration thread (see my sig) for calibration displays.
If you are using DVE, I suggest using this pattern:http://mistermax.smugmug.com/gallery/429986
|This is a frame shot of the Digital Video Essentials grayscale and ramp (Title 12, Chapter 14). This is how it should look when unaltered by the DVD player and converted straight to RGB.
This screen can be used to help dial in both brightness and contrast. On the ramps, you can see dots on either end of the spectrum. I believe the value at the point of the dots directly corresponds to the value of the bar directly above/below it. These are at 16 (black) and 235 (white). The area above/below is the headroom (0-15 and 236-255). The point is to calibrate black/brightness until everything 16 and under is black. You should be able to see in the ramp the gradations above that point. Once you know where 16-black "should be", you can adjust above or below that to taste, and still know where to set it back for reference. Ie., if you need to adjust it up/down for a certain movie that has a poor transfer, then you would know what value to reset it to.
Theoretically, contrast/white will be set the same way. However for example, my DLP is capable of extreme light output. So if I were to try and turn up contrast (in the service menu) so that the brightest white comes down to 235, I get the kind of banding like in Finding Nemo I explained on the previous page of this thread.
And yes, digital displays don't really bloom. You'll have to use other methods to check.
Other screens you might use:
Black pluge (blacker-than-black) which is below the 16-black level and should not be seen, along with bars that are just above blackhttp://mistermax.smugmug.com/gallery/429986/1/17381111
This one has bars just above 16-black and just below 235-white:http://mistermax.smugmug.com/gallery/429986/1/17703315
(although no matter how high I tried turning up my contrast in the service menu practically, I still could see the just-below-white bars -- that's why I had to test for coloration (yellow) in the grayscale ramps/bars, along with real-world material like Finding Nemo).
For a Contrast level test, pop in Finding Nemo and go to the scene I mentioned and try turning up contrast all the way. See if you get any banding in the water areas. I'm not sure how your plasma will handle this, but I know I get severe banding (3-strips of blue) if I turn up the contrast and/or color saturation too high here. Actually, the Finding Nemo scene was my ultimate test, because with every other DVD or test patten I tried, it still looked "fine" when I turned Contrast up really high. I used the service menu for this, because the default for brightness is at 50, while contrast is at 100 (can't go above 100, so the service menu contrast setting determines the highest value). So I basically set my color around 50-55, found the spot where turning contrast up created banding in that scene, and went just below that.
I definitely suggest reading http://www.avsforum.com/avs-vb/showthread.php?t=523614
(at least the first post). You're not using an HTPC, but there are a lot of links to other threads and websites about calibration, using test patterns, how displays work, etc.
BTW, I am posting a zip file with the black/white bars I was talking about. These use 1280x720 resolution, and feature bars that are 1-25 and 230-255 or so. If you use an HTPC as your DVD player, stuff like this and other test pattern generators makes it really easy to calibrate (compared to just a calibration DVD).
reference calibrator 1280x720.zip 131.4365234375k . file