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There's a great little option on the Crop tool that allows you to correct an image like this. So, this is a shot of a painting, of course, but at an angle, so that the flash that went off wouldn't bounce directly off the glass, hits in front of the painting and cause a reflection or a blowout to happen in the image there. So what we want to do is, of course, straighten the image so that looks like we took the picture from dead-on. Very useful technique if let's say you'd want to take a picture of the building from the storefront or from the street. Let's say right where you want to take the shot from the angle you're at, there is a light pole in the way or there is a car in the way.
But if you can frame the image just a little bit different by stepping off a couple of steps to one side, where that particular obstacle or the thing that you don't want in the image doesn't fit within the frame, then that's an easy thing for you to fix here after the fact by using the Perceptive Crop option. So I'm going to press the C key on my keyboard to switch to the Crop tool. By default, when you drag out a crop boundary, it doesn't really know anything about Perspective. It's just a rectangular shape. When you hit Return, that's what's going to be cropped. But it turns out that once you have a crop boundary drawn out and it's active, in the Options bar, there is a little checkbox here for Perspective.
Before you turn that on, if you go and you click on the corner handle again and again, it's just resizing the width and height in a rectangular fashion there. If I turn the checkbox on now, now each corner can be moved independently. You can create kind of a Perspective shape or a trapezoid. So the trick here is to line out each corner of the crop boundary with a corner of what you know was supposed to be true straight corner there. So I'm just kind of roughly lining those in, I'm going to zoom up a couple of times, Command+Plus, Command+ Plus, Ctrl+Plus on Windows.
I'm going to hold down my Spacebar to get my Hand tool temporarily and I'm just going to pan around, until I can see the handles in the corners and I'm just going to fine-tune their positions. So in the space again to pan and repositioning those corner handles just to make sure they're dead-on with the corner of the mat here on the painting. Okay, once I've got it looking pretty good, I'm going to zoom out, Fit to Window, Comman+0 or Ctrl+0.Then I'm just going to press the Enter key or the Return key to actually apply this crop. You can see it straightens the image as it crops it out. Pretty cool, ha! All right, to fix this last effect, we're going to make the white mat look white again.
So I'm going to get my Marquee tool. I'm going to press the letter M. I'm going to go ahead and drag out a rectangular marquee shape here, around the painting. Sometimes it's actually easier to select what you don't want to adjust and then get the opposite of that selection. So, there's a reverse selection command that's called Inverse under the Select menu. It's Inverse and there is a keyboard shortcut for that as well, Command+Shift+I or inversed. That gives you the opposite of your current selection and then I'm just going to fill that selection with white. I'm going to go to the Edit menu and choose Fill. Instead of 50% Gray, we'll say use White, click OK.
Then we'll just deselect, Command+D or Ctrl+D. There is my finished, straightened, cropped and Perspective-adjusted with a white matte completed picture there.
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