June 2010 | Tips and tricks

What to do with unwanted edge pixels

In a virtual mosaic, sometimes areas are obscured by overlapping images with void pixels. Void pixels are gaps between valid imagery and the actual image edge. These often are black but can be other solid colors. When displayed in a virtual mosaic, this kind of image can cause undesirable breaks in the coverage.

SOCET GXP provides functionality to make these void pixels transparent.

To control void pixel behavior:
  • In preferences, select Multiport > Virtual Mosaic Display panel, select the Hide Void Pixels check box to turn void pixels on, and the underlying images in the mosaic fill any black areas.

This process cleans up visible artifacts when the mosaic inputs have solid border pixel areas. If the void areas have a range of pixel values, set a minimum and maximum value. In most imagery, void pixels typically have the same minimum and maximum value set. For example, 0 is a very common pixel value used to represent transparency in imagery.

Hide void pixels off.

Hide void pixels off

Hide void pixels on.

Hide void pixels on

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