The process of overlaying one image onto another within Paint.NET involves utilizing layers. Each image is placed on a separate layer, allowing for independent manipulation and positioning. This enables the combination of multiple images into a single composite. For example, a user might wish to insert a logo onto a photograph, placing the logo image on a layer above the photograph.
Layering images in this manner offers significant flexibility in image editing. It allows for non-destructive editing, meaning changes made to one layer do not directly affect other layers. This capability is valuable for creating complex compositions, adding textures, and incorporating graphical elements into existing images. The method has evolved from traditional darkroom techniques in photography to become a standard feature in modern digital image editing software.