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Your camera has a big collection of image playback features. You've already seen how it displays an image immediately after you shoot. But of course you can also go in and browse all the pictures that are stored on your media card. To enter Playback mode, you just hit the Play button right here. That takes me back to the last image that I shot. I can see here that this is the image number 24 of 24, so I know exactly how many images are in this folder. I get some other data displayed here. I can see that this image is stored on CompactFlash card in this folder with the file name.
It's a raw image with these pixel dimensions. It was recorded on this date and time, using an FX lens. I can navigate the images on the card using the multicontroller: just left and right to go forward and backward or in this case backward and forward. I can also zoom out by pressing the Zoom Out button, and right next to that there's a little checkerboard indicating that pressing that takes me to a thumbnail grid. And I can actually go out quite a ways here and see a good number of images all at once on one screen.
Not only does it display these, I can navigate these, and when I pick a particular image I can then zoom into it using the Plus button. And that zooms me right back into that image and then I can navigate from there. Continuing to press the Plus button zooms me into the image, giving me a chance to try to check focus. When I'm zoomed in, this little box shows me a navigation control that I can pan around using the multicontroller. So I can look at a very specific area of the image, and when I'm done, zoom right back out to normal display.
There are other pages of metadata that you can display, but to do that, you need to activate them. And I do that here from the Playback menu, from the item Playback Display Options. You can see by default nothing is turned on. It's only showing basic playback information. I can activate these things, as many or as few of them as I want. I'm going to turn them all on, including None. This sounds confusing. Why would I activate None? I think you will see it why in a moment. I'm going to turn on all these things. When I've got them all configured, I need to hit the Done button at the top of the page to make them stick.
Now I'll go back into Playback mode. First thing is, I see now that it's showing me the focus point that the camera used when I was focusing. This is actually a pretty handy thing to have at your disposal. There are a lot of reasons that an image might be soft, that you might have had a slow shutter speed and so the image might suffer from handheld shake. You might have very shallow depth of field, so one part of the image may be out of focus. Or you may not have been paying to your Autofocus system. It may have chosen a bad focus point, or you may have accidentally bumped the focus point selector.
So being able to go in and see exactly where it focuses is a good way to diagnose problem when an image is out of focus. It's your chance to find out if you're chance to find out if you're using your Autofocus system properly, or if you merely have a slow shutter speed or something else. If I hit the up and down arrow buttons here, I cycle through those other pages. Here's that None page that I selected. It gives me just a clean view of my image. Here's a page that gives me a lot more data. I get a small thumbnail. I see the Metering mode I was using, the Shooting mode I was in, shutter speed aperture, ISO, the focal length of my lens.
I can see if I had any exposure compensation or flash exposure compensation dialed in, what my white balance is, my color space, where the image is stored, which media card. And I see a histogram. If you're not familiar with the histogram, if you don't understand why this is valuable, check out my Foundations of Photography: Exposure course. It will walk you through everything you need to know about histograms. The short of it is this histogram display gives you an extremely reliable way to assess the exposure of your image. You can't really judge exposure simply by looking at the image on the back of the screen, because the image on the back of the screen is not very accurate for a lot of things.
The camera amps up the brightness and sometimes the saturation of the image that it puts on the screen to make it more visible in bright light. So you really can't tell much about exposure from simply looking at it here. It's great to have a histogram and know how to use it. Continuing on, here is some more data, just more settings, noise reduction, active D-Lighting HDR, Vignette Control, retouching, any comments that have been tagged on the image. Still more of those similar types of things, and more, and then finally, a three-channel histogram, which is a great way of identifying color casts in an image.
And then this lets me see if any highlights in the image are overexposed. So this is flashing to indicate that overexposed highlights will be flashing in my image preview here. I don't have any; if I did, they would be flashing pixels. I can even go in and examine individual color channels for overexposed highlights, by pressing and holding the Zoom Out button and then using my left and right buttons, you can see that now the red channel is flashing, then green, then blue. What's nice about this option is if I see that only one or two channels are overexposed, then I know that I can probably recover those in my raw converter, because in a raw file, you can often recover overexposed highlights--or usually recover overexposed highlights--if only one or two channels are overexposed.
Finally, I'm back to my first display. Now those were a lot of pages of information, more than I'll normally need. So I'm going to go back into Playback Display Options and turn some other stuff off. I don't actually care about the shooting data. That's not stuff that I really am going to look at very often. I think I've killed the overview also. But I want to highlight an RGB options, and I like being able to turn all the data off once and for all. I tend to only turn on focus point when I'm confused about focus, so I'm going to turn that back of, go back to Done.
And now when I go to Playback, I have this basic screen. If I can get no metadata. And I've got my histogram displays. Notice that those options stick. Whatever screen I leave off on, that's the screen I will come back to, the view that I will come back to when I next come into Playback mode. So if you want quick access to a histogram, you can just pull that up and know that any time you go into Playback mode that's what you will have. By default, images in Playback mode stay up for 10 seconds.
If you don't do anything to the camera in that 10 seconds, then the display shuts off. You can change that, if you like. You go in here to the menu > Custom Settings > C category Timers/AE lock. You can scroll down here to Monitor off delay. You can see that for Playback mode, it defaults to 10 seconds. I can make that 4 seconds, 20 seconds, 1 minute, 5 minutes, 10 minutes. I can really buy myself a lot of time to review. Now bear in mind, that's going to drain your battery faster if you lengthen this review time.
It means that if you accidentally bump the Playback button while you're walking around, the screen could come up and stay on for a long time. And when the screen is on, that's also going to cause the camera to heat up, which can cause it to cease to function after a point, if it's a very hot day. So there are many other options that you have in Playback mode, and we're going to look at those in future movies.
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