endoffill

Endoffill is a term used in computer graphics, image processing, and data interpolation to designate the final phase of a fill operation. During endoffill, a post-processing pass closes gaps, corrects boundary artifacts, and enforces consistency across the filled region. The term is informal and not tied to a single formal specification, with variations in terminology such as end-pass, post-fill pass, or boundary-fill refinement.

Endoffill is applied in contexts such as rasterization and texture synthesis, image inpainting, terrain generation, and geographic information systems data interpolation. It serves to ensure that edges and seams do not reveal the underlying fill method and that the result looks coherent when viewed at typical display resolutions.

Common endoffill techniques include boundary extrapolation from adjacent filled areas, smoothing or diffusion-based adjustments along the edge, and constraint propagation to honor known border values. Some implementations use simple methods such as clamping edge values to neighboring pixels, while others employ more sophisticated approaches that minimize visual discontinuities or preserve textures.

Performance considerations are important: endoffill passes can add processing time, so they are often tuned to run selectively on complex regions or at reduced resolutions. Overly aggressive endoffill can blur details or introduce artifacts, whereas too little processing may leave visible seams.

See also: fill, inpainting, boundary fill, flood fill, texture synthesis.