Thread: Red Color Bars
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03-02-2011, 02:01 AM
Can somebody give me a tutorial on how to calibrate a monitor by using the red color bars? I can find tutorials on calibrating with color bars all over the internet, but they all use color bars different from the Red ones. Is there even a point in calibrating it with the color bars? Appreciate your help...
03-02-2011, 08:34 AM
Good question. Would it be possible to add SMPTE color bars to the Red One ?
03-02-2011, 08:51 AM
I believe you can already do this, and feed the HD-SDI signal to your monitor. The only caveat is that the signal coming from the Red is an internal debayered image and does not necessarily reflect the best you can get from the Raw.Originally Posted by Nils Ruinet
03-02-2011, 09:30 AM
If it is an HD video calibration reference on an external monitor you want, you should calibrate with an external SMPTE bar or test pattern generator. Forget the camera as a monitor calibration source. RAW doesn't provide a reference. Calibrate your camera LUT to the monitor, not the other way round.
03-02-2011, 12:26 PM
See the IF at the beginning of the statement.
If what you want is just to see what the camera is doing, then you can calibrate the monitor to the camera.
If you are trying to deliver for broadcast then calibrating the camera to the monitor via LUT using external bars makes more sense.
If there is a post step in the middle (i.e. not live to air or somesuch) then calibrating the monitor to the camera is easier and makes more sense as a guide for what post will get to start working with.
RAW does provide a reference... but not to broadcast. Just to the RAW itself.
At least for me I am interested in what the camera is doing on set, not compliance with broadcast standards.
03-02-2011, 12:56 PM
I just want to see what the camera is doing, so I would like to calibrate the monitor to the camera. Can somebody point me to a step by step explanation on how to calibrate the monitor using the type of color bars the Red One generates? The color bars the Red One generates are different from the "usual" bars, so I'm a little lost....
03-02-2011, 01:14 PM
If you to want to see on set what the post guys will see when you hand the footage over either as proxies or with a LUT in the metadata, then you need to calibrate your external reference monitor using an external generator to the same standards the post facility uses. Otherwise you don't have a constant reference point between systems. Of course this doesn't apply to the Red EVF and LCD but I would try to match these with a properly calibrated external monitor for reference too using the internal camera bars as a guide.
03-02-2011, 01:39 PM
Doesn't the camera send SMPTE bars when you put it in test signal mode_SMPTE? this is feeding to an external HD-SDI monitor... Or am I missing something about this - i.e. the red's smpte bars are inaccurate...or not the right bars... or what?
03-02-2011, 03:21 PM
Accurate to, err... what? Aren't SMPTE color bars designed for Rec.709 video? Red is a RAW camera, so what are you trying to achieve with the bars? Do you want bars to match RedColor viewing output?
03-02-2011, 03:36 PM
Red shoots raw, but that raw image data is always reinterpreted later into something else for viewing/distribution right?
A "calibrated" monitor should be something that can be used to "estimate" what an image will look like later.
We all know that the red "Tap" is only 720p, and you can view a downscaled, color-matrixed version of what the sensor sees - either with RedColor, Red Raw, or a user defined look. - Compared to what you see on the monitor you will end up with different (generally better) results later - however - to start with a calibrated monitor will let you get in the ballpark instead of the parking lot...more on this later.
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