Getting boundary of raster image as polygon in ArcGIS Desktop?

If you have Spatial Analyst then you can:

  1. Multiply the raster by 0 to create a constant value raster using Raster Calculator. (be sure to convert it to integer type or step 2 will not work)
  2. Convert the result of step 1 to polygon using the Raster to Polygon tool.

Another solution:

If your have 3D Analyst license then you can use the Raster Domain tool under 3D Analyst>Conversion>from raster (however it does not have the smooth function)


You can use the Raster Domain tool from 3D Analyst to create a polygon with the same extent as your raster data


What about simply digitizing it? Click-click-click-click done.