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Winner: PNGOUT Second Place: Photoshop CS4 Third Place (tie): Infranview, GIMP Fourth Place: FastStone Last Place: ACDsee
The moral to the story? Depending on how well the original png was compressed and how well the app you use compresses the png, the filesize will either shrink or grow.
Cyberbeing
For example, on post #61796 which you uploaded:
Original: 64.5MB (67,611,544 bytes)
Photoshop CS4: 63.1MB (66,107,762 bytes).
GIMP (Compression 9): 63.2MB (66,269,319 bytes)
Infranview (Compression 9) 63.2MB (66,269,327 bytes)
FastStone (Max, Paeth) 63.9MB (66,947,072 bytes)
ACDSee (no metadata or database) 65MB (68,106,365 bytes)
PNGOUT w/ fast settings (Auto, Huffman only, 1 pass): 60.8MB (63,706,206 bytes)
PNGOUT w/ insanely slow settings (Auto, No pass limit): 60.5MB (63,402,439 bytes)
Winner: PNGOUT
Second Place: Photoshop CS4
Third Place (tie): Infranview, GIMP
Fourth Place: FastStone
Last Place: ACDsee
The moral to the story? Depending on how well the original png was compressed and how well the app you use compresses the png, the filesize will either shrink or grow.