topic Build attribute table *from* colormap? in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/build-attribute-table-from-colormap/m-p/166569#M5577 <HTML><HEAD></HEAD><BODY><SPAN>Hi.</SPAN><BR /><BR /><SPAN>I have a lot of rasters (.img) that contain colormaps.&nbsp; Each raster has 70+ classes, but they are all represented as one of only 4 colors in the colormap.&nbsp; I need to reclassify all areas which appear as green to 1, and all other areas to 0.&nbsp; The problem is that each raster has it's own colormap, so I can't simply create one reclassification table and apply it to all rasters. None of the other attributes for the rasters have any correlation with the on-screen colormap-generated color. When I use the "identify" tool on a pixel, I can see an attribute called "color(a,r,g,b)". This attribute does not show up in the attribute table.&nbsp; Is there any way I can transfer this attribute into something that could be used in a raster analysis operation?&nbsp; </SPAN><BR /><BR /><SPAN>Thanks!</SPAN></BODY></HTML> Tue, 15 Jan 2013 16:52:22 GMT kevinbrown1 2013-01-15T16:52:22Z Build attribute table *from* colormap? https://community.esri.com/t5/geoprocessing-questions/build-attribute-table-from-colormap/m-p/166569#M5577 <HTML><HEAD></HEAD><BODY><SPAN>Hi.</SPAN><BR /><BR /><SPAN>I have a lot of rasters (.img) that contain colormaps.&nbsp; Each raster has 70+ classes, but they are all represented as one of only 4 colors in the colormap.&nbsp; I need to reclassify all areas which appear as green to 1, and all other areas to 0.&nbsp; The problem is that each raster has it's own colormap, so I can't simply create one reclassification table and apply it to all rasters. None of the other attributes for the rasters have any correlation with the on-screen colormap-generated color. When I use the "identify" tool on a pixel, I can see an attribute called "color(a,r,g,b)". This attribute does not show up in the attribute table.&nbsp; Is there any way I can transfer this attribute into something that could be used in a raster analysis operation?&nbsp; </SPAN><BR /><BR /><SPAN>Thanks!</SPAN></BODY></HTML> Tue, 15 Jan 2013 16:52:22 GMT https://community.esri.com/t5/geoprocessing-questions/build-attribute-table-from-colormap/m-p/166569#M5577 kevinbrown1 2013-01-15T16:52:22Z