![]() ![]() I could do that just by dragging down here on this point, but maybe I don't want the highlights to get so bright. So let's say I wanted to darken down the tones in the shadow areas of the dune. So, this works good for minor contrast adjustments, but the advantage of working with curves is that it gives you a lot more control. And now if I drag over to the right, I can increase contrast, and if drag to the left I can decrease it. So, in terms of contrast, you might be asking yourself: well what's the difference between adjusting contrast here in curves and using the contrast slider out in the tune image section? So let's go into that tune image section, and if a drag vertically on the screen, I can see my choices there, and there's contrast. This curve is also often referred to as an S curve, simply because it recalls the shape of the letter S. So with a hard contrast curve that we have here, the highlights are being raised up and made brighter, and the shadows are being lowered and made darker. Same thing with the shadow point there, if I tap on that, that corresponds to the darker parts of the histogram that you see on the left side. So if I tap on the highlighted point there, if you draw an imaginary line straight down, it corresponds to the area of the histogram that you see there on the right-hand side: the brighter parts of the image. If you look at the points on the curve, they correspond to the area on the histogram if you draw a straight line immediately down from that point. And in between is that gradual ramp from black to white. So, on the far left side we have total black, and on the far white side we have total white. And this corresponds to the histogram that Snapseed is overlaying over the curve dialogue. So, to this image of the sand dune, I have added a gradient from black to white and then a row of swatches from black to white. And I'm just going to tap on the little swatch booklet there to close the view of all the presets, so we can see the curve in its entirety here. I'm going to go back to the hard contrast just 'cause I think that's a good one to start out with. So, if you go through and take some of these for a test drive, you'll get a sense of how the curve is affecting the image. Hard contrast is a little bit more pronounced. ![]() So for instance, if I tap on neutral, that's no change at all. There's actually quite a lot of presets that are available there, and one of the ways to get a sense of how the curve is affecting the image, if you're new to working with curves, is just to try out some of these presets and see how the image is changing based on how the shape of the curved line is being adjusted. And you can see that down there at the bottom in the thumbnails. So, by default, it starts out and applies a curve preset for hard contrast. So in Snapseed, I'm going to tap on the pencil to get my tools, and I'll just choose curves. If you're already familiar with Photoshop, Lightroom, or similar programs, then you may already be aware of how you can use curves to edit your images. ![]() So, curves is not a feature in a lot of mobile apps, but it's becoming more common in some of the more full-featured, photo-editing apps. There are a lot of really useful ways that you can edit your images in this app, and one of them is to use a feature called curves. I'm referring to Google Snapseed, which is available for both Android and iOS. Hi I'm Sean, and this week on Mobile Photography Weekly, we're going to take a look at a custom editing feature in one of the most useful apps that you can have on your mobile device. ![]()
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