1	If source file is in PNG, it will be overwrited... Do you want to continue? 
2	Auto
3	None
4	Sub (delta x)
5	Up (delta y)
6	Average (delta x&y)
7	Paeth
8	Adaptive (mixed)
9	Xtreme! (Slowest)
10	Intense (Slow)
11	Longest Match (Fast)
12	Huffman Only (Faster)
13	Uncompressed (Fastest)