I never cease to be amazed at the different file sizes I get with compression. It seems that every file is unique and the best method depends on the data being compressed.
Often I find that a dialogue box saved with FastStone Capture (which has an option to set the PNG compression level to 9 (like IrfanView) gives the best results. Opening it in IrfanView and resaving it can increase the file size.
Original 31,290 bytes saved from FastStone Capture at level 9. (Attached)
Saved from IV at level 9 = 45,157
Original compressed with PNG crush in 3 seconds = 31,290 bytes
Original compressed with PNGOUT in 3 minutes = 41,285 bytes (sic)
IV saved file compressed with PNG crush = 31,253 bytes
Often I find that a dialogue box saved with FastStone Capture (which has an option to set the PNG compression level to 9 (like IrfanView) gives the best results. Opening it in IrfanView and resaving it can increase the file size.
Original 31,290 bytes saved from FastStone Capture at level 9. (Attached)
Saved from IV at level 9 = 45,157
Original compressed with PNG crush in 3 seconds = 31,290 bytes
Original compressed with PNGOUT in 3 minutes = 41,285 bytes (sic)
IV saved file compressed with PNG crush = 31,253 bytes
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