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[tmodes <1400254@xxxxxxxxxxxxxxxxxx>]

For the normal "equirectanglular" or cylindrical projection the blender
blend about the 360 deg border by matching the "left" and "right" border
to get a seamless final image.

For the Peirce projection you can't blend about the left/right border - you will get unwanted artefacts. You will have to process each border at its own to don't get jumps in the seams.
This may not be an issue if you don't use this projection in interactive viewers.

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https://bugs.launchpad.net/bugs/1400254

Title:
  Request for Peirce quincuncial projection

Status in Panorama Tools:
  New

Bug description:
  Hey!

  This is a feature request for a Peirce quincuncial projection:
  http://en.wikipedia.org/wiki/Peirce_quincuncial_projection

  Equirectangular seems to be the most common type of projection for
  storing panoramas, yes it is horrible for this purpose. Distortion
  increases as you move further from the equator, and so the size and
  distribution of pixels from the original source image (whether fisheye
  or rectilinear) when forward-mapped into an equirectangular projection
  varies wildly - this makes it a horrible projection considering how
  JPEG compression works, considering one may want to denoise the
  panorama or sharpen it, etc.

  The Peirce quincuncial projection has very limited distortion. From
  Wikipedia, "The part where the exaggeration of scale amounts to double
  that at the centre is only 9% of the area of the sphere, against 13%
  for the Mercator projection and 50% for the stereographic projection".
  When used in cartography, it gives an honest representation of the
  globe. When used for aesthetic purposes in panoramas, it gives a
  unique and interesting look.

  Please consider adding the Peirce quincuncial projection to Hugin.

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