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(Page 2 of 2 pages for this article < 1 2) Friday, February 15, 2008HOW TO: Manually White/Black Balance with a Vectorscope and Paintbox
A chip chart will offer a few additional options. Most chip charts have two gray scales, one above the other with the chips moving from bright to dark in opposite directions. When viewed on a waveform this creates two opposing “stair step” patterns that meet in the middle of the screen. Using the iris control, place white at 100% and black at the proper pedestal value (7.5% for NTSC, 0% for HD). The point where the stair steps cross is your gamma mid-point, or “crossover” point. “Normal” gamma sees the crossover point in the middle of the waveform scale, around 50%. This method provides an objective way of seeing where gamma is set, in case you decide to manipulate gamma to create a look that you’ll have to match at a later date. (Manipulating gamma has the effect of stretching out tones on one side of gamma and compressing tones on the other. For example, moving the gamma crossover point down stretches out the highlights and compresses the shadows.) It’s also possible to manually white balance on a chip chart using only the waveform monitor. Place the waveform monitor in “flat” mode. (The “flat” option shows color saturation, while “IRE” shows luminance.) Using the red and blue gain knobs on the paintbox, make the horizontal stair steps as narrow as possible. When you can’t make them any thinner, you’re white balanced. If you use this method I suggest switching over to the vectorscope to make sure the fuzzy white dot is centered. Knowing tricks like these has saved me on a number of occasions. If you have the tools and a little bit of time, these techniques will ensure peace of mind when working unfamiliar gear or under strange lighting conditions. Training • (Page 2 of 2 pages for this article < 1 2) 
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