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[Bug 678848] Re: matchpoint fails on images with alpha channels

To: hugin-devs@xxxxxxxxxxxxxxxxxxx
From: rew <678848@xxxxxxxxxxxxxxxxxx>
Date: Mon, 06 Dec 2010 08:23:04 -0000
Reply-to: Bug 678848 <678848@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Someone should check if this is still valid. But it sounds like a valid
request to me.

** Changed in: hugin
   Importance: Undecided => Wishlist

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

** Tags added: alpha channel matchpoint

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https://bugs.launchpad.net/bugs/678848

Title:
  matchpoint fails on images with alpha channels

Status in Hugin - Panorama Tools GUI:
  Triaged

Bug description:
  match-n-shift uses PTmender to create conformal input for generatekeys/matchpoint, this data has an alpha channel, which causes matchpoint to fail:

ContractViolation:
Precondition violation!
importImage(): number of bands (color channels) in file and destination image differ.
(/BUILD/hugin-0.7.0/src/foreign/vigra/vigra/impex.hxx:118)
Error! Image can not be opened

matchpoint should ignore alpha data, or even better it could use the alpha channel to define areas where it shouldn't find features.