Global Mapper v25.0

Pixel shifting Issues when Exporting Raster

mashik
mashik Global Mapper User
edited February 2011 in Technical Support
Hello all,
We have a problem with Global Mapper 11

When we export a Raster file (of any kind), and crop it using a selected area feature, the program automatically makes a shift (less then a pixel) to a random direction.

The effect causes a white line on one side of the "tile" and an overlap on the other direction.

Anything we need to change in order to have no shift at all? is this a "known problem"?

(This only happens when we use a shape file as borders for the area feature)

Appreciate your quick reply,



Avner & Mashik
Sightvision

Comments

  • global_mapper
    global_mapper Administrator
    edited February 2011
    The shift is due to the resampling method used by default (nearest neighbor). If your output pixels don’t line up perfectly with the input pixels you will get an apparent sub-pixel shift. If you go to the Options dialog for the raster file(s) from the Control Center and change the resampling method to ‘Bilinear’ or ‘Bicubic’ prior to export you should get blended pixels and the visual sub-pixel shift should go away.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • James Bell
    James Bell James Bell
    edited February 2011
    It is all remove by algorithm for better performance in system then use the pixel point algorithm for this.

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