Fixed AutoTracer to test for grayscale images.
Fixed AutoTracer to test for grayscale images.

JRMeyer/Autotrace,JRMeyer/Autotrace,jjberry/Autotrace,arizona-phonological-imaging-lab/Autotrace,arizona-phonological-imaging-lab/Autotrace,jjberry/Autotrace,jjberry/Autotrace,JRMeyer/Autotrace,JRMeyer/Autotrace,JRMeyer/Autotrace,arizona-phonological-imaging-lab/Autotrace,arizona-phonological-imaging-lab/Autotrace,jjberry/Autotrace,jjberry/Autotrace,arizona-phonological-imaging-lab/Autotrace