fixed export of 32biot pnm pixels
fixed export of 32biot pnm pixels

cha007/vigra,capturePointer/vigra,DaveRichmond-/vigra,psteinb/vigra,hmeine/vigra,stuarteberg/vigra,cbecker/vigra,DaveRichmond-/vigra,kod3r/vigra,psteinb/vigra,DaveRichmond-/vigra,stuarteberg/vigra,ThomasWalter/vigra,dagophil/vigra,timoMa/vigra,mmuellner/vigra,cha007/vigra,capturePointer/vigra,dstoe/vigra,dagophil/vigra,funkey/vigra,hmeine/vigra,cha007/vigra,funkey/vigra,capturePointer/vigra,cha007/vigra,funkey/vigra,cbecker/vigra,mmuellner/vigra,funkey/vigra,ThomasWalter/vigra,stuarteberg/vigra,xiwei-zhang/vigra,martinsch/vigra,kod3r/vigra,dstoe/vigra,dstoe/vigra,mmuellner/vigra,dagophil/vigra,cbecker/vigra,funkey/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,stuarteberg/vigra,dstoe/vigra,DaveRichmond-/vigra,xiwei-zhang/vigra,capturePointer/vigra,timoMa/vigra,cbecker/vigra,mmuellner/vigra,dagophil/vigra,psteinb/vigra,cha007/vigra,stuarteberg/vigra,hmeine/vigra,timoMa/vigra,psteinb/vigra,ThomasWalter/vigra,DaveRichmond-/vigra,capturePointer/vigra,cbecker/vigra,martinsch/vigra,hmeine/vigra,mmuellner/vigra,capturePointer/vigra,martinsch/vigra,martinsch/vigra,stuarteberg/vigra,kod3r/vigra,hmeine/vigra,ThomasWalter/vigra,xiwei-zhang/vigra,stuarteberg/vigra,dagophil/vigra,dagophil/vigra,mmuellner/vigra,hmeine/vigra,xiwei-zhang/vigra,ThomasWalter/vigra,kod3r/vigra,cbecker/vigra,cha007/vigra,cha007/vigra,capturePointer/vigra,funkey/vigra,timoMa/vigra,timoMa/vigra,kod3r/vigra,timoMa/vigra,psteinb/vigra,hmeine/vigra,xiwei-zhang/vigra,timoMa/vigra,dstoe/vigra,xiwei-zhang/vigra,DaveRichmond-/vigra,martinsch/vigra,DaveRichmond-/vigra,martinsch/vigra,funkey/vigra,dstoe/vigra,ThomasWalter/vigra,dagophil/vigra,mmuellner/vigra,kod3r/vigra,kod3r/vigra,psteinb/vigra,dstoe/vigra,psteinb/vigra