Sibgrapi 2011 will be the 24th Conference on Graphics, Patterns and Images (formerly Brazilian Symposium on Computer Graphics and Image Processing). It will be held in the beautiful city of Maceió, Alagoas, Brazil, between August 28th and August 31st, 2011. Sibgrapi is annually promoted by the Brazilian Computer Society (SBC) through the CEGRAPI committee, in cooperation with the Eurographics Association. Information on past Sibgrapi events can be found at the CEGRAPI committee page. SIBGRAPI 2011 is being organized by the Institute of Mathematics of the Universidade Federal de Alagoas (UFAL).