hugin-devs team mailing list archive

[Yuv <706407@xxxxxxxxxxxxxxxxxx>]

From
http://wiki.panotools.org/Hugin_FAQ#I_get_visible_bands_in_the_sky_and_other_flat_areas.2C_what_can_I_do.3F

If the banding looks like posterization then this is likely due to a
error with estimation of the camera response curve. To get an accurate
response curve, Hugin needs significant vignetting and/or bracketed
exposures. The workaround is to Reset... the Camera Response in the
Hugin Camera and Lens tab and stitch again - Hugin usually produces
acceptable results for a simple panorama when the camera response
parameters are all zero.

If there is a wave of light and dark patches in the sky this could be
due to vignetting in the source photos, you can deal with this by
optimising Vignetting (Vb, Vc, Vd) in the Hugin Exposure tab. Another
workaround is to increase the number of enblend blending levels, try
setting '-l 29' as the enblend Command line options in the Hugin
Stitcher tab.

** Changed in: hugin
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/hugin/+question/146157

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https://bugs.launchpad.net/bugs/706407

Title:
  Remapping creates color bands in gradients

Status in Hugin - Panorama Tools GUI:
  Invalid

Bug description:
  The nona component of Hugin introduces color banding artifacts while
  remapping images. Smooth gradients in the source image show as jagged
  bands in the remapped image.

  Here's a typical example, remapping a single fisheye image into Panini General:
    Source image: http://tau.ac.il/~tromer/misc/hugin-banding-bug/TEST.JPG
    Hugin project: http://tau.ac.il/~tromer/misc/hugin-banding-bug/TEST-panini.pto (attached)
    Result image: http://tau.ac.il/~tromer/misc/hugin-banding-bug/TEST-panini.jpg

  Look at the sky in the top right corner. It's smooth in the source, but badly banded and jagged in the result.
  (Please ignore the pixelated blob on the left, it's blurred for privacy.)

  The above happens with current hugin hg and libpano13 svn, as well as
  Fedora 14's packaged versions. The artifact does not seem
  significantly affected by the choice of projection or by the nona
  interpolation mode set in Hugin.