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How to remove black edges from rasters?

It is possible to remove black edges from the georeferenced rasters in GIS Cloud Map Editor.

Note: Only RGB 8-bit and 16-bit rasters are supported.

Follow these steps to remove black edges from rasters:

  1. Add georeferenced raster on a map in Map Editor.
  2. Open Layer Properties (Layer tab – Edit layer).
  3. Click on the white box under Appearance.
  4. Set NoData value to 0 and under Output format select PNG. Note: If you are using 16-bit rasters, then set Source range from 0 to 65535. For 8-bit rasters, this modification is not needed.

    5. Click OK and Save.

Repeat process for each raster in the map. 

If black edges didn’t disappear please check:

  • Only RGB (3-band) rasters are supported
  • NoValue data is usually 0, but it can be different too. Try adjusting NoData Value to 1,2,3 etc.
  • If the edges are white, set NoData Value to 255
  • If there are some “crumbs” left in place of black edges, it is necessary to adjust the source range. The Source range is by default set from 0 to 255. If there are “crumbs” left, that means that the black edge was not black but a shade different. You can try to adjust the source to e.g., 5 to 255. Values from 0 to 4 will be hidden.

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