enfuse produces black output with certain TIFFs

[Erik Krause]

enfuse produces black output if --wContrast=1 with certain TIFF files, especially files created by align_image_stack.

Reproduce: use align_image_stack on some (slightly) misaligned JPGs. enfuse the resulting TIFFs using the --wContrast=1 command line switch (tested only together with --wExposure=1 --wSaturation=1)

Shall I upload a test case here (app. 5MB)?

[Erik Krause (erik-krause)]

Logged In: YES
user_id=1737000
Originator: YES

In fact any value but 0 for --wContrast causes black output.

[nobody (nobody-users)]

Logged In: NO

I do not get black enfused image but dark one with unnatural colors.

[Erik Krause (erik-krause)]

Logged In: YES
user_id=1737000
Originator: YES

nobody wrote:

> I do not get black enfused image but dark one with unnatural colors.

Interesting. My results are almost entirely black turning in a very dark grey at the upper edge if I use 8 bit images as input. With 16 bit images the result is like the output of a high pass filter (edges white, uniform areas black).

[Erik Krause (erik-krause)]

Logged In: YES
user_id=1737000
Originator: YES

The test case can be found here: http://www.erik-krause.de/enfuse_align_test.zip
run align_image_tack on the images and enfuse the result with -wContrast=1

[Andreas Metzler (k-launchpad-downhill-at-eu-org)]

I have downloaded the testcase and run through the following steps with hugin 2010.0.0 and enblend/enfuse 4.0:

align_image_stack -p foo.pto *JPG

Open foo.pto in hugin, switch to Stitcher tab, select both "Fused and blended panorama" and "Blended and fused panorama", set enfuse options to --exposure-weight=1, (+ set Compression to packpits to speed things up.) Save and exit.

Run "make -f foo.pto.mk foo_blended_fused.tif foo_fused.tif"

Neither of the resulting images shows the behavior you described, could you retest with the new versions of hugin/enblend?

[rew (r-e-wolff)]

I've downloaded the test images. I have followed Andreas' suggestion, up to "align_image_stack".

I then opened foo.pto in hugin, and started on clicking on intermediate files that I'd wanted to keep, but then I saw "exposure corrected low dynamic range", which is what I think I want. I then hit stitch now, and got an almost completely white image.

I then loaded the images into a fresh hugin. With default settings, enblend complains about overlapping images, but with "exposure fused from stacks" I get reasonable results.

I then asked hugin to genrate a HDR tiff file. (I don't know how to view exr files today), and got an all-transparent image.

[Launchpad Janitor (janitor)]

[Expired for Enblend because there has been no activity for 60 days.]