HuginStitchProject(2019.0.0.a369cbe55179) error while remapping LDR images

[Ty Wait]

After using Hugin (2019.0.0) to align, rotate, and crop a matched pair of images, I ran HuginStitchProject manually to generate a TIFF file (running it from within Hugin gets a parsing error). HuginStitchProject occasionally encounters an error when remapping the LDR images. Usually a rerun is successful, but this time it wasn't, so I thought it was worth reporting.let me know if you need more data.

Since bug reports can have only one attached file, I catenated the error log file and the PTO file.

[Ty Wait (tywait)]

I just found that one of the images being stitched is in 8-bit RGB and the other in 8-bit grayscale. Perhaps that is the problem (though Hugin had no errors when aligning the images).

[Ty Wait (tywait)]

(parenthetical comment: now I see I can use "Add comment" to attach more than one file to a bug report. Sorry I didn't know that earlier.)

[tmodes (tmodes)]

I think the first error image is enough:
caught exception: image <snip>- FedEx Scan 2019-07-06_16-07-28(2).jpg has 3 channels, while <snip> FedEx Scan 2019-07-06_16-07-28(1).jpg uses: 1

Also Hugin itself refuses to add RGB and grayscale images to the same project. So I don't know how you could achieve this from the GUI.

[Ty Wait (tywait)]

I was surprised, too. I'd encountered the 3 channel / 1 channel error before with a few other image pairs that weren't a match (one RGB, one grayscale), but in those cases I caught the error text you pointed out.

Maybe a bit of eye/brain fatigue on this one caused my miss.

I eventually got the images related to this bug converted to the same channel count and stitched together.

I'm OK with closing this bug.

Thanks for looking into it. Sorry for any time it cost you.

[Launchpad Janitor (janitor)]

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