fixed test_color.py (tests occasionally failed when they got unfortunate random numbers)
fixed test_color.py (tests occasionally failed when they got unfortunate random numbers)

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