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How do I remove the black border after warping an image in Didger 3?

In Didger 3, calibrating and mosaicking multiple images required warping the images after calibrating. This warping step expanded the extents of the image and created a thick black border around the image. This border is undesirable when mosaicking the images, as it can obscure portions of any adjacent images.

The black border is not created in Didger 4 or Didger 5.

If you are using Didger 3, there are several ways to remove the black border:
  1. During the warping step, specify a smaller range of Output Map Extents to prevent creation of the border.
  2. Let the border be created, but specify the black border color to be transparent when combining the images in the vector project.
  3. Import each image into a separate layer in a vector project and then clip the image to a polygon.
  4. If you have just a single image, you can change the Project Limits in a vector project to limit the extents of the image to exclude the black border.

Each method is described in detail in the attached newsletter article Removing the Black Border After Warping an Image in Didger 3.pdf. You can choose which best suits your needs. 

Updated October 19, 2016

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