2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10217We review the various steps for the extraction of extended sources, principally galaxies, from the DENIS images. The capabilities of DENIS are studied with simulated images. A few real DENIS J and K_s-band images are presented for very bright galaxies and one nearby rich galaxy cluster.Invited talk at Euroconference on "Near-Infrared Sky Surveys", ed. P. Persi (Mem. Soc. Astr. It.), in press (meeting held in January 1995 in San Miniato, Italy)Astrophysicstext