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ArcScan is installed and registered, but the ArcScan toolbar is still disabled.
If ArcScan is not installed and registered, or the licensing has not been added for ArcScan, see the Related Information Section.
ArcScan is not being enabled for use, or the raster layer in question has more than two color values.
Three criteria must be met for the ArcScan toolbar to become activated. Verify that all three criteria are true, performing the steps below to do so as needed.
If the raster has more than two colors, use the 'Unique Value' or 'Classified Rendering' options to separate the raster file into two colors. Be sure to specify only two values in your classification.
To begin an edit session an editable polyline feature class must be added to the ArcMap TOC. You can use ArcCatalog to create an empty feature class if one is not already present in your map.