You can use the Straighten tool to realign an image
vertically or horizontally. When the resulting image is bigger than
the original image, this tool also resizes or crops the canvas to
accommodate straightening the image.
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Select the Straighten tool
.
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To straighten all of the layers in the image, select
Rotate All Layers, and then choose an option from the Canvas Options
menu (this menu is available only if you select Rotate All Layers):
- Grow Or Shrink Canvas
To Fit
-
Resizes the canvas to fit the rotated image. Straightening
causes corners of the image to fall outside of the current canvas.
The straightened image will contain areas of blank background, but
no pixels are clipped.
- Crop To Remove Background
-
Crops the image to remove any blank background area that becomes
visible after straightening. Some pixels will be clipped.
- Crop To Original Size
-
Keeps the canvas the same size as the original image.
The straightened image will include areas of blank background and
some pixels will be clipped.

Straightening and cropping to remove the background
-
To straighten the image, do one of the following:
-
To align horizontally, draw a line in the
image to represent the new straight horizontal edge.
-
To align vertically, hold down the Command key and
draw a line to represent the new straight vertical edge.
-
To automatically straighten the image
and leave the canvas around the image, choose Image >
Rotate > Straighten Image. The straightened image will
contain areas of blank background, but no pixels are clipped.
-
To automatically straighten and crop the image, choose Image >
Rotate > Straighten And Crop Image. The straightened
image will not contain areas of blank background, but some pixels
will be clipped.