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HD Monitor Calibration - White Balance and Color Bars — shoot > data > post
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This post is in regards to HD Rec, 4k color bars .mp4 download. There are several issues relating to standard definition video and monitoring that do not apply to HD. NTSC Setup, or 7. Setup is for standard definition only. Phase: There is no Phase control for digital HD monitoring. While color bars will help you to setup aspects of your monitor, they do nothing to reveal whether or not it's calibrated, meaning it's accurately reproducing colors and a neutral chroma-free gray scale.
This is the most critical component of monitoring and is accomplished through a White Balance Adjustment. It specifies a white point at D65, degrees kelvin. If this white point is placed correctly, it should ensure that all colors and grayscale within the gamut are accurately reproduced. If it does not, then there are calibration issues that cannot be resolve through a white balance adjustment alone. These adjustments are made using a spectrophotometer or colorimeter aka "probe".
The process of white balance adjustment with a probe is similar from monitor to monitor. Some can use a probe to do this process automatically whereas others must be done manually. It will tell where this white image is hitting in the gamut by way of x and y coordinates.
From here, RGB gains are adjusted until the probe verifies that white is hitting the correct coordinates, 4k color bars .mp4 download, x. If you're using an OLED monitor, you will use different coordinates than x. These aren't the most accurate probes available but they are well priced and I've had very good results aligning and matching displays with them.
Color temperature is denoted by "x" and "y". Luminance level is "Y". The x and y points will always be the same for both Gain and Bias. The Y level for Bias will change with the gamma setting be it 2. Consult your manufacturer!
The newer Rec. This topic is beyond the scope of this post so I've written a separate article on it. Once we're successfully white balanced and selected gamma, we can now use color bars to finish the calibration process. The Pluge will help you set your Brightness Black Level. It consists of a Here's the same signal's luma waveform. This helps to see where everything in the field is hitting in terms of level, particularly the pluge.
And Vectorscope. You can see that each of the color bars lines up perfectly with thier targets indicating that these are pure, undiluted primary and secondary video colors. Set your gamma to 2. Set your 4k color bars .mp4 download, Contrast, and Chroma to their default levels. If you have a display that can be custom white balanced, 4k color bars .mp4 download sure that you're aligned before starting this. If you're working with a facility on a project, they can send a technician with a probe to you and he can do it for you.
Or you can talk to you manufacturer and get a list of recommended probes for use with your display along with x,y Color Temperature4k color bars .mp4 download, and Y Luminance targets so you can do it yourself. This is best done in a dark environment so if you're outside or in an unshielded location, try and keep as much ambient light and direct light off the display as you can. Everyone has their own way of doing this.
I start with Contrast which is the most subjective. Now back it off a little bit. This will be different on every display and really 4k color bars .mp4 download smart way to do is with a probe that reads Luminance level. By default, increasing Contrast will also somewhat raise the black level. The right chip which reads 3. Now check your contrast again. If you need to adjust, make 4k color bars .mp4 download to go back and check your pluge again.
By going back and forth between these 2 adjustments, you should be able to arrive at a satisfactory black and white level. Now check Chroma. Your monitor most likely has some sort of Blue Only feature. This is used to help you correctly set your color saturation level with Chroma. Turn it on and have a look. Adjust the Chroma level on the display until you're looking at solid, alternating bars of equal value. The larger top portion of each individual bar needs to blend into the smaller section beneath it.
By tweaking back and forth between all of these adjustments, you will be able to find the most accurate settings your monitor can produce. Please note that some monitors don't have Blue Only but can display in Monochrome. The Chroma calibration process with Monochrome is identical to Blue Only.
Here's the luma waveform of the signal. Follow the exact same steps outlined above when using this signal to arrive at correct Brightness, Contrast and Chroma levels.
The biggest difference is with the pluge. When setting Chroma with Blue Only, this is what you should be looking at with the correct level:. Some recording decks will output these but very few cameras will. I don't think this is as useful a calibration signal as there's no pluge to help you set black level.
When looking at this color field with Blue Only and if your Chroma level is set correctly, you should be seeing something like this - bars of equal and alternating value:. If it looks something like this, you're in good shape. If you're looking at something 4k color bars .mp4 download this, then the Chroma level is incorrect.
At the end of the process you should be looking at something like this:. Here's a handy diagram detailing what's what in the ARIB:. And when you're all done, this is what you should be looking at:.
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