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This weekly course covers the most common questions videographers encounter when shooting and editing with DSLR cameras, from choosing a frame size and frame rate to understanding moiré. Authors Rich Harrington and Robbie Carman will also help you understand the impacts of compression and the difference between cropped (or micro 4/3rds) and full-sized sensors in cameras, and much more. This continual FAQ guide is a handy way to find the answers to the questions that plague you the most.
Robbie Carman: When you're on set trusting your eyes and your eyes alone to judge exposure, it's a dangerous thing. Fortunately, you actually have some tools built into your DSR most likely, that are going to help you judge exposure. Let me show you what I mean. Here in this scene, I've got this set up pretty much the way that I like it. Looking on my external monitor here, things look pretty good. But what I want to go ahead and actually do, is take a still picture on my So let's just go ahead and take a still real quick. Smile So now that I've taken the still. All I'm going to do is in on my playback mode here, playback.
And then I'm going to hit the Info button here on my Canon 7D couple times here. To where I bring up my histogram. Now the histogram is an analytical tool that you can use to measure brightness values across the entire tonal range. And what do I mean by tonal range? Well, I mean from black to white. And if you look at the histogram right here, you can see that I have a lot of values, these spikes right here, spiked up towards the bottom part, or the left hand side of the Histogram. These are dark values. The higher the spike, the more values I have at that point of the tonal range.
And this kind of makes sense if you look at the image. I have this black sign back here, I have these bookshelves, and this dark wood. I have the dark wood of the guitar. The frame of the window and so on. As I go up, I have some spikes here, kind of in the middle. And that screw of the mid tone or middle portion of the tonal range. And I'm guessing that's probably our, our artist face here. Probably a little bit of this window here. And then I have few highlights right here, at the very top. So you can judge exposure overall exposere, or the lumia only portion of your shot.
By using this histogram. But if I go ahead and hit Info one more time, I actually get two histograms. I get a luma only histogram which is just showing me my brightness values, but I also get a histogram that splits out the signal into red, green, and blue components. And this is really nice to know. So if you have maybe something that's really strong red in the scene and it's really bright. Well that would show up here on the right hand portion of the red histogram. So, using both of these tools with in tandem with each other, you have a really good way to judge exposuring your image, as well as where red, green, and blue are falling in the tonal range.
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