Public bug reported:

There are panoramas like nature landscapes that need to take more from
the projection.

In those cases, some or more pixels could be taken from the projection
outside the crop with more or less distortion, but without becoming
unnatural.

For such cases, a distortion/morph/reshaping could be made similar to
GIMP cage processing or Adobe's Camera RAW boundary warp tool.

The goal would be either calculate some approximate polygon around the
projection and generate a transformation in a range 0% - 100% that would
reshape the projection to a rectangle, leaving the user to adjust the
amount according to his taste, either let the user adjust himself the
projection similarly to GIMP's cage tool, either make both options
available in Hugin's tradition, depending on the chosen mode, simple or
advanced/expert.

In order to better explain the reason for this request, I provide here
my limited experience I've had with GIMP trying to reshape panoramas
I've made with the cage tool. I put emphasis on "my experience".

In short, I have stitched 9 images in Hugin, that generated an 148MB TIFF of 
about 8600 x 2600 px.
I've opened GIMP and made a cage of 14 points, then started adjust it.
On my i7 920 with 24GB RAM system, took about 15 mins to calculate the initial 
cage definition, then about 1-3 mins to move points. It is a painful process 
and sometimes the cage disappears for some reason (bug?), sometimes I need to 
come back to the process, in which case I have to redefine the cage again and 
again, which is totally unproductive, as the cage can't be persisted even using 
GIMP native format, xcf. Also, working with the full image is a consuming 
process, so I think Hugin should work with a smaller sample, as the panorama 
preview seems to use.

** Affects: hugin
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1839479

Title:
  Add boundary warp feature

Status in Hugin:
  New

Bug description:
  There are panoramas like nature landscapes that need to take more from
  the projection.

  In those cases, some or more pixels could be taken from the projection
  outside the crop with more or less distortion, but without becoming
  unnatural.

  For such cases, a distortion/morph/reshaping could be made similar to
  GIMP cage processing or Adobe's Camera RAW boundary warp tool.

  The goal would be either calculate some approximate polygon around the
  projection and generate a transformation in a range 0% - 100% that
  would reshape the projection to a rectangle, leaving the user to
  adjust the amount according to his taste, either let the user adjust
  himself the projection similarly to GIMP's cage tool, either make both
  options available in Hugin's tradition, depending on the chosen mode,
  simple or advanced/expert.

  In order to better explain the reason for this request, I provide here
  my limited experience I've had with GIMP trying to reshape panoramas
  I've made with the cage tool. I put emphasis on "my experience".

  In short, I have stitched 9 images in Hugin, that generated an 148MB TIFF of 
about 8600 x 2600 px.
  I've opened GIMP and made a cage of 14 points, then started adjust it.
  On my i7 920 with 24GB RAM system, took about 15 mins to calculate the 
initial cage definition, then about 1-3 mins to move points. It is a painful 
process and sometimes the cage disappears for some reason (bug?), sometimes I 
need to come back to the process, in which case I have to redefine the cage 
again and again, which is totally unproductive, as the cage can't be persisted 
even using GIMP native format, xcf. Also, working with the full image is a 
consuming process, so I think Hugin should work with a smaller sample, as the 
panorama preview seems to use.

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