Rotation
The process of turning an image by a specified angle around a center point, commonly used to correct orientation.
Rotation turns an image around its center point by a specified angle. It is frequently used to fix the orientation of smartphone photos or correct the tilt of scanned documents.
Rotations at 90, 180, or 270 degrees simply rearrange pixels without quality loss. However, arbitrary angles like 45 or 15 degrees require interpolation, which may introduce slight quality degradation. Non-right-angle rotations also produce areas outside the original rectangle, resulting in either blank margins or cropped edges.
Digital cameras and smartphones store orientation information in the Exif Orientation tag. Viewing software reads this tag to auto-rotate the display, even though the actual pixel data may remain in landscape orientation. The image crop tool allows rotation and cropping in a single step.