RGB gain and offset??

EddieDZ · 09-26-2006, 12:13 PM

Well i access the service menu on my Vizio L37, the only thing it has is "Auto burnin" on/off and Red Gain, Blue Gain, Green Gain, Red offset, Blue offset, Green offset.

i have no idea what they do or mean but i wrote the default numbers down and played around with it, i pressumed RGB gain is the "intensity" of the R, G or B. the offset i pressume is off the color goes, for example the offset on the blue can be a greenish blue or something else.. thats just what im assuming, gain is pretty self explanitory but i dont know about offset...

pointers anyone?. i calibrated my display using DVE, dve comes with blue, green and red color tint filters to adjust the color and tint on the TV. i nailed it down perfectly, using the blue filters everything was perfect and matched, so did the red, however with the Greens it did not match so im assuming theres something slightly wrong with decoding the greens. im also having a hard time adjust the contrast, the DVE didnt help to much in that field since the basic calibration contrast chapter was aimed at a CRT tv

.

flair1111 · 10-10-2006, 08:42 PM

Cant help much here, but my TV also has the gain for the seperate colors. I noticed if I got all of the settings as perfect as I could using DVE, I could then turn the color all the way to zero. Then with it set like this i went to the gain settings and found that anything above 50% allowed a bit of that color to stick out beyond a true black and white picture, so i assume leaving the gain at 50% is the closest I can get to being right without a true calibration.

EddieDZ · 10-11-2006, 08:32 AM

I know mr. D6500k knows about this lol

. i started experimenting and i jacked up the gain on R, G and B all the way up, its max was obviously 255, i had to then readjust the normal settings, i ended up putting Color all the way down to almost nothing hahahah.. oh well.

d6500k · 10-11-2006, 10:25 AM

The gains (drives) and cuts (bias) controls the amount of each primary. The drives are to be used when calibrating for D65 on the higher IRE levels while the cuts are used for the lowest IRE's.

Calibrating by "eyeball" is problematical at best, which is why we use precise instrumentation to accurately set these numbers. Interaction can occur and depending on the display, the process can take a few hours at times.

If you attempt the "eyeball" method, you only real choice is to display a crossed ten step grayscale pattern. Try to use the controls to eliminate/diminish any color tint to the levels paying special attention to the darker boxes. Any hint of green should be eliminated as our eyes percieve this color better than most.

Again, only a measured calibration will provide acuracy, but you can at least eliminate the awful OOB blues in the highest registers with success.

Doug k

EddieDZ · 10-12-2006, 03:18 PM

hhhhmmm..interesting... thanks

09-26-2006, 12:13 PM	#1
EddieDZ PSN is Free Join Date: Jan 2006 Location: Saint John, NB Canada Posts: 4,707	RGB gain and offset?? Well i access the service menu on my Vizio L37, the only thing it has is "Auto burnin" on/off and Red Gain, Blue Gain, Green Gain, Red offset, Blue offset, Green offset. i have no idea what they do or mean but i wrote the default numbers down and played around with it, i pressumed RGB gain is the "intensity" of the R, G or B. the offset i pressume is off the color goes, for example the offset on the blue can be a greenish blue or something else.. thats just what im assuming, gain is pretty self explanitory but i dont know about offset... pointers anyone?. i calibrated my display using DVE, dve comes with blue, green and red color tint filters to adjust the color and tint on the TV. i nailed it down perfectly, using the blue filters everything was perfect and matched, so did the red, however with the Greens it did not match so im assuming theres something slightly wrong with decoding the greens. im also having a hard time adjust the contrast, the DVE didnt help to much in that field since the basic calibration contrast chapter was aimed at a CRT tv .

10-10-2006, 08:42 PM	#2
flair1111 My funeral will be in HD. Join Date: Apr 2005 Location: north georgia USA Age: 34 Posts: 109	Cant help much here, but my TV also has the gain for the seperate colors. I noticed if I got all of the settings as perfect as I could using DVE, I could then turn the color all the way to zero. Then with it set like this i went to the gain settings and found that anything above 50% allowed a bit of that color to stick out beyond a true black and white picture, so i assume leaving the gain at 50% is the closest I can get to being right without a true calibration. __________________ 42" Hitachi UltraVision 42HDT51 HDTV 32" Sony Trinitron KV-30HS420 HDTV PS1 PS2 PS3 6.1 Surround 8.98 stuff and a 33:2 hdtvdh tv as well as a small house cat?

10-11-2006, 10:25 AM	#4
d6500k ISF Technician Join Date: Jul 2005 Location: Oregon Age: 56 Posts: 1,038	The gains (drives) and cuts (bias) controls the amount of each primary. The drives are to be used when calibrating for D65 on the higher IRE levels while the cuts are used for the lowest IRE's. Calibrating by "eyeball" is problematical at best, which is why we use precise instrumentation to accurately set these numbers. Interaction can occur and depending on the display, the process can take a few hours at times. If you attempt the "eyeball" method, you only real choice is to display a crossed ten step grayscale pattern. Try to use the controls to eliminate/diminish any color tint to the levels paying special attention to the darker boxes. Any hint of green should be eliminated as our eyes percieve this color better than most. Again, only a measured calibration will provide acuracy, but you can at least eliminate the awful OOB blues in the highest registers with success. Doug k __________________ Website: www.6500kcalibrations.com Serving Oregon, Washington and Idaho. Twice yearly tours to St. Petersburg/Tampa Fla. & Southernmost Texas.

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10-11-2006, 08:32 AM	#3
EddieDZ PSN is Free Join Date: Jan 2006 Location: Saint John, NB Canada Posts: 4,707	I know mr. D6500k knows about this lol . i started experimenting and i jacked up the gain on R, G and B all the way up, its max was obviously 255, i had to then readjust the normal settings, i ended up putting Color all the way down to almost nothing hahahah.. oh well.

10-12-2006, 03:18 PM	#5
EddieDZ PSN is Free Join Date: Jan 2006 Location: Saint John, NB Canada Posts: 4,707	hhhhmmm..interesting... thanks