ArcScan is greyed out

Discussion created by lifrah on Jan 11, 2014
Latest reply on Oct 15, 2015 by amyhager
ArcScan is greyed out. I think it does not work because my map document is colored. I have tried to change the raster layer symbology to unique values but there is no option to click that. In the layer properties i only have the choice between stretched and RGB Composite.
Is there a way that i can use ArcScan with a colored Map document and how can I do this?

I would be so grateful if someone could help me.