[GRASS-dev] [GRASS GIS] #2048: i.pansharpen limited to 8-bit imagery

[GRASS GIS]

#2048: i.pansharpen limited to 8-bit imagery
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  Reporter:  Nikos       |      Owner:  grass-dev@…
  Alexandris             |
      Type:  defect      |     Status:  new
  Priority:  normal      |  Milestone:  7.6.1
 Component:  Imagery     |    Version:  svn-trunk
Resolution:              |   Keywords:  i.pansharpen, sharpening, fusion,
                         |  brovey, ihs, pca, 8-bit
       CPU:  All         |   Platform:  Unspecified
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Comment (by cmbarton):

 Before I start on this, I have a couple questions:

 1. #774 is a discussion about support for >8bit values in i.rgb.his and
 i.his.rgb. I cannot tell from this discussion or from the module manual if
 this happened or not. I'm guessing it did not. Can anyone verify?

 2. The main place where i.pansharpen is explicitly 8bit is in the
 histogram matching method. The main goal of pan sharpening, AFAICT, is to
 produce an RGB image that is visually pleasing at spatial resolutions
 equivalent to a high res pan band. The original 'data' are lost regardless
 of the bit depth. Given this, the most straightforward solution to #1 and
 #2 is to transform the original 4 bands (RGB and pan) to 8bit before doing
 any processing. Any reason not to pursue that strategy?

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2048#comment:27>
GRASS GIS <https://grass.osgeo.org>