Binary package “optipng” in ubuntu natty

advanced PNG (Portable Network Graphics) optimizer

 OptiPNG is a PNG optimizer that recompresses the image files to a smaller
 size. It losslessly reduces the bit depth, the color type and the color
 palette of the image, runs a suite of compression methods and strategies,
 and selects the compression parameters that yield the smallest output file.
 It also recognizes several external file formats like BMP, GIF, TIFF and