Download of BTPC-4.1.tar.bz2 (BTPC-4.1.tar.bz2 ( external link: SF.net): 30,321 bytes) will begin shortly. If not so, click link on the left.
PyramidWorkshop is an image-compression System based upon the scientific work of John Robinson (inventor of BTPC) about image-compression with adaptive linear predictors and is in average more efficient than PNG/JPEG2000.
