In the paper highly ecient algorithm for lossless image coding is described. Its high data compaction performance is obtained at the expense of computational complexity, still being not as high as for other top rated methods. The algorithm is based on predictor blending principle, outputs of 27 dierent sub-predictors are combined, hence its name Blend-27. Eciency of Blend-27 is tested on a set of 15 usually used benchmark images, and compared to that of over 20 methods, including the best known ones. The algorithm appears to be currently the most ecient technique for lossless coding of natural images.