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The original is in SuperPNG Fabricated Profile colour space which is rated at gamma 2.2.

The edited one is in sRGB colour space. (Which is correct for web graphics)

Not that it's contributary to the problem but you should really work in AdobeRGB(1998) colour space and have PS convert this to SRGB when you save it out. (Checkbox in the save For Web Window)

You can change the colour profile if you want to but even if you don't, ALWAYS use Save For Web when saving graphics for the web.

With PNG you have 2 choices.....PNG-8 and PNG-24.

The difference is that PNG-8 transparency is either ON or OFF.....anything else gets replaced with the matte colour...in your case, black.

(Hence all the nasty black pixels)

PNG-24 OTOH supports variable opacity....like in the drop shadow on those sprites.

Use Save For Web and PNG-24 and you'll find it should be ok.

Colour profiles can be changed from Edit > Change To Profile > AdobeRGB(1998) from the dropdown list.

Regards.

MrTom.