This is a method I discovered by accidentally adjusting contrast and brightness and seeing that these parameters have an effect on rgb levels during continuous measurements. Instead of focussing primarily on rgb levels at each window ire interval, I concentrated on what would be the best contrast and brightness level for my hdtv that would allow rgb levels close to 100 % from 30 ire to 80 ire. The reason that I call it the sweep method is simply sweeping or raising/lowering the contrast or brightness levels to produce consistent rgb levels across the grayscale.
I just calibrated my Samsung PN50b450 by using hcfr software and xrite eyeone lite and gamma response is pretty level. I have been DIY calibrating for over two years. Recently, I initially started using the HD DVE disc with the red/green/blue levels even at 100% at 80 ire. I then noticed the other rgb levels at 50, 60, and 70 were not level but were greatly affected when adjusting the contrast and brightness levels. I kept adjusting the rgb levels at from 50 to 80 ire by using the contrast/brightness controls (and also readjusting the rgb gain and offset levels if necessary to tweak the levels for consistency)
, and later separately rgb levels from 30 to 40 ire, until all rgb levels of the greyscale from 30 to 80 consistently came within 2 percent of 100% levels. This made my gamma a straight flat line and a terrific picture. My highest delta E is 2.5.
I think that all hdtv's have a sweet spot which can be found by adjusting (slowly but surely) the contrast and brightness settings to where rgb levels are consistent between 30 and 80 ire. For example, if your 70 ire has a red level at 95%, adjusting the constrast or brightness may raise this level while not affecting the 80 ire rgb levels. After I completed my adjustments, my 100 ire had a measurement of 40.8 ftL and the 10 ire was exactly .65% of the 100 ire, which may be perfect.
I call this the "sweep" method and it primarily involved adjusting the contrast and brightness levels and a lot of trial and error. See the images below for the gamma and rgb graphs.
Suggestions and protocols imho:
1. measure each window pattern while adjusting contrast or brightness in continuous measurement mode (green arrow). if using DVE patterns (not for avs) turn off continuous measurements when changing window patterns. also readjust rgb gains and offsets if necessary and for greyscale consistency when changing to a different contrast or brightness level.
2. make sure sensor is in middle of window pattern to avoid light impact on measurements from edges
3. light from on screen controls used while making adjustments may impact measurements. may need to turn off controls while in continuous measurements to get true measurement
4. plasma displays such as mine may need to warm up as much as 1 hour or more to obtain true color measurements
5. recalibrate sensor every 20 minutes or just prior to final greyscale measurement
6. turn off sharpness settings on your dvd or blu ray player when setting sharpness for your hdtv
7. follow Curt Palme's calibration for dummies religiously
The cell light was originally set at 10 - as recommended for this display, but readjusted to 9 to level out a bump in the gamma graph. I also attempted to lower the cell to 8 but the gamma graph just went bonkers.
The following are my settings for a dark room setting. The resulting gamma was 2.36 (the hcfr gamma setting preference for 2.4 for dark room environment), with static contrast at 1173:
color space auto
offset: red 29, green 25, blue 35
gain: red 25, green 25, blue 45
hdmi black level low
all options off
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