Saves a MemoryImage to a png file. See also: writeImageToPngFile which uses memory a little more efficiently
writePngToArray
See Implementation
![void writePng(string filename, ubyte[] data, int width, int height, PngType type, ubyte depth)](http://arsd-official.dpldocs.info/arsd.png.writePng.2.html){kind=link}
![ubyte[] writePng(PNG* p)](http://arsd-official.dpldocs.info/arsd.png.writePng.3.html){kind=link}
Saves a MemoryImage to a png file. See also: writeImageToPngFile which uses memory a little more efficiently