Exporting to PNG

Blitz3D Forums/Blitz3D Programming/Exporting to PNG

has anyone been able to export to Png without using external libraries? I have a program that I saves out to png but I can't find any info on how its writting to a file and havent been able to find anything on code archives or forums so if you've done it or know how please let me know thanks.

Might find something on www.wotsit.org ?

that was the first place I looked but Ill check it out again thanks

PNG files use Huffman compression, similar to .zip files, which is no easy feat to program.