fixed color analysis function bug in z700 script
fixed color analysis function bug in z700 script

AntonSax/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,jshoyer/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,AntonSax/plantcv,danforthcenter/plantcv,jshoyer/plantcv