Andy, I took a look and it appears that the DXF color palette (at least the colors I know in it) doesn't have anything real close to the brown used by default for contour lines in Global Mapper, so black ends up being the closest color. I would suggest changing the color used for the contour line types in Global Mapper to something perhaps a little redder on the Line Styles tab of the Configuration dialog to get something closer to what you need. Andy, The problem with DXF is that internally it uses a palette index to specify the color to use for a feature, but does not have a mechanism for actually storing the palette in the file. Therefore most DXF files use the default palette used by AutoCAD many years ago, which is quite limited in the number of colors. An application could decide to use its own color palette for DXF files, but then no other application would display the data with the same colors as the DXF file doesn't actually define what colors to use.

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I'm actually not surprised that there isn't a good brown. If you remember the original purpose of the DXF format is for CAD drawings, which are typically done on a black background, so brown wouldn't be a commonly used color. It is only recently that DXF files have starting being used for mapping files, even though they are not a good fit for that application.

Exported dwg line/layer colors of linked cad details I have searched different forums for this but seems like none has taken up this issue 'controlling the color or layers of Linked Cad details when exporting back to dwg'. MeshLab the open source system for processing and editing 3D triangular meshes. It provides a set of tools for editing, cleaning, healing, inspecting, rendering, texturing and converting meshes. It offers features for processing raw data produced by 3D digitization tools/devices and for preparing models for 3D printing.

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Use the Colors tab of the Modify DWG/DXF Export Setup dialog to specify how colors are exported to DWG or DXF files. Click File tab Export Options (Export Setups DWG/DXF). Select the setup to modify. Click the Colors tab. For Export colors as, select one of the following values: Index color (255 Colors). For colors that are set by category, the indexed colors specified on the Layers tab of the Modify DWG/DXF Export Setup dialog will be used. For colors that are set by category, the indexed colors specified on the Layers tab of the Modify DWG/DXF Export Setup dialog will be used Specify how colors are exported to DWG or DXF files. On the Colors tab of the Modify DWG/DXF Export Setup dialog (see Exporting to DWG or DXF), select either of the following options to specify how colors are exported to DWG or DXF files: Index color (255 Colors). Click Export Options (Export Setups DWG/DXF). On the Layers tab of the Modify DWG/DXF Export Setup dialog, Revit displays settings for the currently selected setup. Select one the following Export layer options to specify how Revit elements with view-specific graphic overrides will be mapped to CAD layers. (Graphic properties of Revit elements, such as color, line weight, and line style, are.