The process of combining multiple images of the same scene to enhance detail, reduce noise, or extend depth of field relies on specialized computer programs. These applications align and merge similar images, often taken with varying focus points or under different conditions, to create a single, superior final image. As an example, astrophotography frequently employs this technique to overcome limitations in light sensitivity and atmospheric distortion by stacking numerous short-exposure images.
This method yields several advantages. It can significantly improve image quality, unveiling finer details and reducing random variations in brightness or color. Furthermore, it enables the creation of images with extended depth of field, ensuring sharpness across the entire frame, which is particularly beneficial in macro photography. Historically, the manual merging of images was a laborious task; however, dedicated software automates and streamlines the process, making it accessible to a broader range of users.