fixed signed/unsigned mismatch
fixed signed/unsigned mismatch

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