![]() When you release your mouse button, Photoshop will rotate the image inside the preview area to straighten it (assuming it was crooked). I'm going to click across the roof on the left side of the building in my photo. ![]() Then simply click and drag across something in the image that should be straight, either horizontally or vertically. We can do that using the Straighten Tool, which is the second tool from the top on the left side of the dialog box. To start with, let's make sure the image is straight. Before we fix our keystoning problem, we should take care of a couple of other potential problems first which will the make it easier for us to fix the keystoning. Photoshop's large Lens Correction dialog box appears, with a few tools along the left, a large preview area in the middle and several options for correcting lens problems along the right. Go to Filter > Distort > Lens Correction. Notice how the building appears to be leaning backwards with the sides tilted inward rather than being parallel to each other as they should be: I'll be using Photoshop CS4 here, but any version of Photoshop from CS2 on up will work.Äownload this tutorial as a print-ready PDF! We'll look at how to use the Lens Correction filter in this tutorial. Up until recently, we had a choice of using either the Crop Tool or the Free Transform command, but in Photoshop CS2, Adobe introduced the powerful Lens Correction filter which quickly replaced those other two methods as the fastest and easiest way to correct keystoning. ![]() ![]() However, there are times when you'll wish there was some way to correct this perspective problem, and Photoshop gives us a few different ways to go about it. Keystoning can sometimes be a desirable effect since it can add a real sense of drama to the image. This problem actually exists any time you need to tilt the camera back to get something tall into the photo but it's most noticeable with buildings due to their straight parallel sides. Usually, unless you're fond of climbing trees or you have a friend at the fire department, standing on the ground and tilting the camera back a bit is the only way to get the top of a tall building into the photo, and since the camera is tilted away from the building when you snap the image, with the top of the lens being further away from it than the bottom of the lens, the building ends up looking like its leaning backwards. Have you ever tried taking a photo of a building only to have the building look like it's leaning backwards? That's a perspective problem known as keystoning, and it's caused by the building and the camera lens being on two different angles. ![]()
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