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In iPhoto '11 Essential Training, Derrick Story offers an in-depth tour of the popular photo management software from Apple, demonstrating its various features for organizing, editing, and sharing images. The course covers techniques to categorize and combine images into custom collections using iPhoto's geotagging, face detection, and Smart Album features, and offers insight on how to perform key image corrections and enhancements. Also covered are tutorials on building customized slideshows and outputting collections to calendars, books, and greeting cards. Exercise files accompany the course.
I'd like to work with Exposure and Contrast sliders right now, and once again I am going to pull up two images side- by-side in Compare mode while we edit. So we'll take these two shots here. I hold down the Command key to select those, click on Edit, and then we'll go to Full Screen also because I like having all the real estate I can get my hands on. So this first shot here, you'll see that we have a gap in our histogram up here.
So in the Levels movie, I talked about moving the slider in to make that correction, but you have another method also and that's using the Exposure slider right here. Now Exposure works with Highlights. And essentially what we're going to do, instead of moving the slider to the edge of the histogram, the Exposure slider is going to move the histogram to the edge over here. Watch how this works. So I am just going to take this and just move it this way.
You can watch, as the histogram moves, the image brightens, and that's what I mean. Exposure works with the highlights. You notice that there are some changes to the middle tones and to the darks, but essentially it's the right side of the histogram that's moving. I'm going to take it to right about there and that what the Exposure slider does. Now, let's work on Contrast.
We'll take this image right here. This is from Munich and this shot I believe is from Cologne. So two Germany shots. Now, this shot was taken on an overcast day, you can see that. A lot of times what happens on overcast days is that our images lack contrast. They're what we call flat, and what Contrast does, the Contrast slider, is that it will move the histogram in two different directions at the same time.
So it will move this part of it out toward the blacks and then move this part of it out towards the highlights. That's what contrast enhancement is. As I move the slider, you'll be able to watch the histogram do its thing here. So I'm going to move it this way and see how the histogram is creeping towards the edges, and then you can see the difference in the image itself. Now, as I'm moving it, you see that I'm getting some information crawling up the side here.
You usually want to avoid that. That means that you're losing tonal information there. in other words, with blacks, you have some areas that are what we call plugging-up, in other words there is no detail there. Now, on an image like this, I think you're pretty okay because having these small areas plug up is not a big deal. But we have a correction for that, that I am going to talk about when we get to Highlights and Shadows, that would allow you to basically leave this as it is, but yet still correct that.
But for now, we are just going to leave it right where it is and I am going to hold down the Shift key. You can see how that Contrast slider sort of brought life back into this image, and again, very useful for shots that you take on cloudy days.
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