make multichannel optional, default to False
make multichannel optional, default to False

rjeli/scikit-image,vighneshbirodkar/scikit-image,vighneshbirodkar/scikit-image,vighneshbirodkar/scikit-image,paalge/scikit-image,rjeli/scikit-image,paalge/scikit-image,paalge/scikit-image,rjeli/scikit-image