Gain=contrast
Bias=brightness
Also called cuts & drives with RPTV's
Drives=contrast
Cuts =brightness
Digital PJ's usually have RGB-contrast RGB-brightness.
Contrast RGB's effect the lighter part of video or 50IRE up.
Brightness RGB's effect the darker part of video or 40IRE down.
A good way to eyeball a grayscale is to freeze a vertical IRE gray pattern. This pattern will show you 10IRE steps from black to white in shades of Gray.
Any unwanted color in the darker area you work with the brightness rgb's.
Any unwanted color in the lighter area you work with the contrast rgb's.
These patterns are in Avia and DVE. Or anything with step boxes of gray like the Avia Pluge pattern with steps, or Needle pulse, the THX optimizers brightness pattern has step/boxes of gray.
Overall the concept is interesting. We're trying to make each shade of gray (steely gray) with no color tones. This will make the colors be at their best.
Tune the basics first, contrast,brightness,color
The next thing to do is find which color temp gets closest to gray by toggling through the choices.
Then use the 50% format to fine tune.
If you need to remove blue from the light grays, lets say 4 clicks, stop make it just 2 clicks and in turn increase the red and green 2 clicks each for balance. Or you could leave blue where it was and start by increasing red & green.
The balance thing isn't written in stone. Ok first you tuned your brightness level, this sets the green for the brightness RGB area. So if you see green in the dark gray steps, just increase the Red & Blue to balance out the green to make gray.
That's it, you can use this for RPTV's, CRT projectors, and Digitals as long as you can find the RGB control. With my Toshiba RPTV I have to do into the service menu.
This doesn't get you ISF D65k but it sure will take the green or purple out of Leeloo's face in the ledge scene.
Good luck
Bias=brightness
Also called cuts & drives with RPTV's
Drives=contrast
Cuts =brightness
Digital PJ's usually have RGB-contrast RGB-brightness.
Contrast RGB's effect the lighter part of video or 50IRE up.
Brightness RGB's effect the darker part of video or 40IRE down.
A good way to eyeball a grayscale is to freeze a vertical IRE gray pattern. This pattern will show you 10IRE steps from black to white in shades of Gray.
Any unwanted color in the darker area you work with the brightness rgb's.
Any unwanted color in the lighter area you work with the contrast rgb's.
These patterns are in Avia and DVE. Or anything with step boxes of gray like the Avia Pluge pattern with steps, or Needle pulse, the THX optimizers brightness pattern has step/boxes of gray.
Overall the concept is interesting. We're trying to make each shade of gray (steely gray) with no color tones. This will make the colors be at their best.
Tune the basics first, contrast,brightness,color
The next thing to do is find which color temp gets closest to gray by toggling through the choices.
Then use the 50% format to fine tune.
If you need to remove blue from the light grays, lets say 4 clicks, stop make it just 2 clicks and in turn increase the red and green 2 clicks each for balance. Or you could leave blue where it was and start by increasing red & green.
The balance thing isn't written in stone. Ok first you tuned your brightness level, this sets the green for the brightness RGB area. So if you see green in the dark gray steps, just increase the Red & Blue to balance out the green to make gray.
That's it, you can use this for RPTV's, CRT projectors, and Digitals as long as you can find the RGB control. With my Toshiba RPTV I have to do into the service menu.
This doesn't get you ISF D65k but it sure will take the green or purple out of Leeloo's face in the ledge scene.
Good luck