I found the best way to straighten images in Photoshop is to use the measure tool, which fortunately takes all the guess of the process work. As you'll see in a moment, as long as you have something of the photo that should be straight, Photoshop almost all of the work do for us! Measurement tool is hidden behind the eyedropper tool in the tool palette, and you have to click and hold down your mouse button on the eyedropper tool for a second or two. One of fly-out menu appears and tells you other tools hiding behind it. Click to select the measure tool.
First of all, you want to get something in your picture that should be straight, horizontally or vertically. Then, you want to drag along its border with the measurement tool so Photoshop has something to work with when trying to calculate warped how the photo actually is. In this case, I click and drag horizontally along the roof of the building behind the freedom of Mrs. Clearly the roof should be completely level, but is obviously not at the moment. I can simply click once on the left side of the roof and now my mouse button pressed, drag on the right side of the roof. Photoshop uses the angle of the line that we just created to discover how the image should be rotated to correct it.
So, basically, to straighten something all you need to do is click and drag with measure tool along the edge of something in the photo that should be straight horizontally or vertically. You can search in the Options bar at the top of the screen and see the angle of the line you just drew (this is the number listed on the right of the letter "A"). In my case, we can see that my line is on a 1.9 degree angle:
The Options bar should be showing the angle of the line that you drew with the measurement tool. Photoshop now uses this light to know how much to turn the image to correct it. To find the command "Turn canvas - arbitrary" click on the Image menu at the top of the program, choose canvas rotation, and then select arbitrary:
Go to Image > rotate canvas > arbitrary. I have to laugh whenever I do that, because the word "arbitrary" actually means at random or by chance, but this is exactly the opposite of what we do here. We will not for random image rotation or nothing left to chance. We used the tool to find exactly how a corner our image should be rotated by, and now Photoshop may use the information we have given to straighten our image without any guess work. As I have already said, a large part of the problem with Photoshop learning comes to move to the terminology, and in this case, I do not know what thought Adobe.
However, life continues. Once you choose "Arbitrary", Photoshop opens the dialog of canvas to rotate, and as we can see, all the work has already been done for us. In my case, Photoshop is already entered in a 1.85 for the Angle option value, and he even recognized that the image must be rotated counter-clockwise, CCW option is also selected:
Photoshop tutorials: The "rotate canvas" dialog box with the angle and the direction already selected for us. You may wonder why Photoshop is entered an angle of 1.85 when the Options bar showed an angle of 1.9 a moment ago. The reason is that Photoshop rounds off the corners in the Options bar to 1 decimal place, so he showed same 1.9 If the angle of the line we drew with measurement tool was actually 1.85. The angle indicated in the Rotate Canvas dialog box is the correct angle.
Everything we need to do is click on the OK button in the Web dialog box rotate output and have Photoshop rotate and straighten picture for us. You should see that the image is now properly rotated and straightened. Everything seems great, and fortunately that the Statue of liberty is based is no longer on the right. We adjusted the image without any work of guess with measure tool and the canvas to rotate command.
You will notice that there is a minor problem. When we did turn the image in the document window, we have created some blank areas of white cloth outside the photo. We will want to finish things off the coast by removing these areas using Photoshop crop tool. You can select the crop tool in the tool palette, or simply press the letter c on your keyboard to select with the shortcut:
Using the crop tool click on close to the upper left of your image and made dragging downward, downward to the right to create a border around the area of the image that you want to keep. You can refine your selection by dragging one of the handles of angle or by dragging the top, bottom, left or right sides of the selection:
Use the crop tool to drag a selection around the part of the image that you want to keep. Once you've dragged your cropping border, press enter (Win) / return (Mac) to have Photoshop crops the image.
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