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Transparency is not a property of a polygon itself, rather it is a property of the layer containing the polygon (like symbology). Take your polygon data, and store it in an IFeatureLayer. From IFeatureLayer, get ILayerEffects, which is an interface of IFeatureLayer. Transparency (0% to 100%) is a property of ILayerEffects. Also, note this from ESRI ...


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Is combining the basemap and the contours in ArcMap and exporting from there not an option? If you haven't tried that, it's where I would start. Otherwise, I would export your contour lines using the PNG format - on the 'Format' tab of the "Export Map" dialog you can specify a color to be transparent or specify the background to be transparent. One of ...


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There is a Knowledge Base document entitled FAQ: What is the best format to use when inserting logos into a map document while maintaining transparency? which says: Logos are usually designed in a vector illustration package such as Adobe Illustrator, and then exported to a pixel-based format. However, exporting the logo as EMF will maintain the ...


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This is more of a strategy than a proven answer. This assumes that the black triangles are part of a rectified image. Can you save the image file in a format that supports transparency such as png format. That would enable you to set the white to transparent as well as manually select and delete the black triangles using an image editor. Deleted parts ...



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