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[Bug 678936] Re: enblend fails on EXR (hdr) blending

To: hugin-devs@xxxxxxxxxxxxxxxxxxx
From: rew <678936@xxxxxxxxxxxxxxxxxx>
Date: Mon, 06 Dec 2010 09:52:36 -0000
Reply-to: Bug 678936 <678936@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Seems similar to bug #679520 . (black areas. ).

I'm starting to suspect enblend has an uninitialized memory access somewhere.
This leads to ugly stripes in some cases, and black areas in others.

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https://bugs.launchpad.net/bugs/678936

Title:
enblend fails on EXR (hdr) blending

Status in Hugin - Panorama Tools GUI:
New

Bug description:
I think I came across a bug in enblend (CVS20080718), but since there is no bug tracker in enblend, I document it here.

I was testing thoroughly hugin SVN3251 in both Windows XP and Ubuntu Linux 8.04.

The box is an AMD 2x 6000+ with 6GB RAM and I made sure I had plenty of HDD space.

The project: A full spherical panorama, six shots around, three exposures each, output resolution 7000x3500.

enfuse went through it no problems (although I identified some cosmetic issues in the user interface to it through hugin <http://sourceforge.net/tracker/index.php?func=detail&aid=2032140&group_id=77506&atid=550441>)

then I went for the fully fledged HDR. The process seemed to run well through hugin (although it was taking a lot more time than PTGui 8beta6 or Autopano Pro 1.4.2). I let hugin retain all byproducts (individual non merged images and stacked HDR images) which all looked good. But the blend was just mostly black with some areas from the panorama.

This happened in both Windows and Linux, with two different outputs. Then I run the process from the command line in Windows and the output was once again different but not correct.

When I blend only the first two stacks from the CLI, the output is OK.

The first three stacks, I get a bit of black areas again.

The second pair of stacks blended well.

The last pair of stack had a large black area.

Trying to add an additional stack to one of the first two blendings also results in black areas.

At <http://www.photopla.net/hugin/hdr/enblend-hdr-errors.7z> you will find the first three test blends (from hugin in windows and linux, and from the CLI).