Posted 19 April 2007 - 06:35 PM
Posted 19 April 2007 - 08:55 PM
Posted 19 April 2007 - 11:13 PM
Are there cameras that have a higher rate than that?
What would be the compression ratio for VideoStream (RGB) mode on the Viper?
Posted 20 April 2007 - 05:31 AM
Posted 20 April 2007 - 10:28 PM
Am I getting noise based on white balance? I was testing while balancing through different gels.
Edited by Andy Yeomans, 20 April 2007 - 10:29 PM.
Posted 21 April 2007 - 07:13 AM
Posted 22 April 2007 - 03:57 PM
After going into the picture profile of which I already saved, I adjusted the setting for the AE Shift to the max of +7. From what I can tell, the exposure does not shift when going from light to dark areas. Also I set the AGC (Auto Gain Control) Limit to 0dB...even though I have the camera in manual mode I don't want to take any chances in adding gain automatically.
If you know of a better way to fix this, please let me know, that would be much appreciated.
Posted 23 April 2007 - 04:40 AM
when whitebalancing, certain chanels are boosted depending on the light you balance under, so it stands to reason that the more extreme balance you request, the more noise (IE a balance under 1/2ctb filter would have less noise than 1 ctb.)
It sometimes cannot be avoided to use whitebalance (when under floros for example) but you can get your camera as close as possible with glass filters to reduce the work the electronic white balance does. ENG cameras have their filter wheels, but prosumer cameras don't have any wheel. I have not yet found a reliable answer as to weather these cameras are nativly balanced at 3200k or midway bewteen 3200 and 5600, but almost every CCD or CMOS chip comes nativley in tungsten balance (a distinction resulting from the dyes used in the bayer mask)
Bottom line if noise from white balance is a concern, do everything you can to filter it to the correct light and use your presets (preset tungsten is usually best with 85 filter under daylight) glass filters induce no noise, though it will cut the sensitivity of the chips.
also note that these white balance noise problems are worse in prosumer cameras, since their DSP is in a lower byte-width (usually 10 or 12 max, pro cameras run in 14 or 16 bit)
hope that helps
Posted 24 April 2007 - 10:01 PM
Now for another question:
How do I calibrate my CRT monitor to view footage from the camera AS IS?
I remember adjusting an lcd and following the steps of adjusting the brightness and contrast all the way up. Because there is a big difference when watching footage from an lcd and the same stuff on a CRT, the image always seems to be brighter on the lcd and closer to what is real.
Posted 25 April 2007 - 06:40 AM
crt hd monitors are insanely expensive though. if you have one chances are you're renting it and then you can have the rental company calibrate it for you. the crt hd tv's aren't really hd since their masks only have like 500 lines.
Posted 25 April 2007 - 04:55 PM
Use SMPTE bars to properly configure your monitor.
-Use the camera to display SMPTE bars on the monitor
-turn the colour off or all the way down.
-note the 3 thin bars at the bottom right of the monitor known as PLUGE bars; adjust brightness or luminance until the left most bar is as black as the middle bar. You should still be able to distinguish the middle bar from the right.
-Turn the colour back to the middle.
-Press the blue only button on the monitor (if it has one) or use a blue filter such as wratten 80A layered until you can see no other colour but blue.
-Adjust the colour until the bar in the top left is exactly the same tonality as the bar on the very right of the spectrum. (there may be a reference below the bars to assist.)
I wouldn't rely on the rental house to calibrate the monitor as you need to re-adjust it every time there is a significant change in temperature or it has come under an impact of any kind. During video shoots when the the DP and the Director rely upon the monitor it is proper to have an assistant recalibrate the monitor every half hour / hour. Make sure it is shielded from light when calibrating.