how convert png to pnm?

i develping application read barcode.

using gocr open source.

, insert gocr source xcode source , test good.

problem application read pnm file not png or jpeg.

want convert png pnm.

there way?

 

get cgimage uiimage, here how @ pixel data:
http://developer.apple.com/mac/library/qa/qa2007/qa1509.html

should straightforward output pnm:
http://en.wikipedia.org/wiki/netpbm_format

 

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