Blown out highlights in pano, but not in all of the individual images

[Bill Miller]

I have not had this problem before and looking for guidance.

Pano captured with a DJI Mavic 3Pro. 25 dng images. Imported from the onboard storage to mac. Then, imported to ptgui pro for stitching. I acknowledge that some of the images (facing toward the sun) are blown out when inspecting them in LR, but all other images appear balanced. Normally, when shooting sunsets, the stitched pano is excellent except blown out in the bright/sun areas. 

However, in this case, the resulting pano is blown out across the ENTIRE sky and some of the landscape.

I have given LR a try at stitching the same images: much better but with many misalignments. 

I also tried eliminating those images with bright sunlight from the ptgui project, but the resulting pano is just as blown out.

Can anyone provide input?

Thanks!

[John Houghton]

Bill, Have you tried converting the images in LR to TIFF (preferably 16bit) for input to PTGui?  That should give better results.

John

[PTGui Support]

Hi Bill,

I think it's caused by shooting in automatic exposure mode, and PTGui
compensating for the exposure differences.

If Exposure Compensation is enabled in Panorama Editor - Blending
sidebar (enabled by default), PTGui will brighten up the shorter
exposures, and darken the longer exposures in order to get evenly
exposed images. This greatly improves the blending.

Some of the shorter exposures will get brightened by default, but this
can be compensated for by reducing the overall exposure of the panorama:
see the Exposure slider in the Post Processing sidebar.

But better results are obtained by enabling tone mapping (in the Tone
Mapping side bar).

Alternatively you can disable Exposure Compensation. For some panoramas
this will look fine, for others you may run into blending artifacts.

If you need any further help, don't hesitate to make your project
available for download and I'll take a look.

By the way, PTGui 13 has much improved the handling of DNG images from
DJI drones. If you're using an older version, do give it a try:
https://ptgui.com/beta

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Bill Miller]

Thank you John Houghton, I will keep this suggestion in mind:)

[Bill Miller]

Thank you, Joost. I will work on this today:)

[Bill Miller]

Hi again, Joost.

Here is a link to the 25 images of a circular rainbow. Would you be so kind as to stitch these to show me the quality that can be achieved? I'd like the rainbow to be a true circle (as close as possible) which will likely mean the horizon will also have curvature...that would be acceptable. 
And if possible, please let me know the steps you took to create it, other than the basics. (I tried to use the beta 13 but my subscription doesnt allow).

Thanks in advance, Bill

https://photos.app.goo.gl/xShgofyeVmw84ium9

[PTGui Support]

Hi Bill,

Maybe it's me, but I was only able to download small jpegs from Google
Photos.

Could you share the DNG files some other way? Google drive, dropbox,
wetransfer all should work.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Bill Miller]

I see that:(

Yes, Im uploading to dropbox and will provide link shortly.

Bill

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[Bill Miller]

Lets try with this dropbox link…

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[Erik Krause]

Am 18.07.2024 um 17:00 schrieb Bill Miller:
> I'd like
> the rainbow to be a true circle (as close as possible) which will likely
> mean the horizon will also have curvature.

Here is your perfect circle with a straight horizon.

--
Erik Krause
http://www.erik-krause.de

[Erik Krause]

Am 18.07.2024 um 18:16 schrieb Bill Miller:

> Lets try with this dropbox link…

And this is the project file for the whole panorama, where, in
equirectangular projection, the rainbow will not be round. But this is a
property of the projection. If you view the panorama in a spherical
panorama viewer, it will be perfectly round if you move the view
straight at it.

In this project file I converted the DNGs to TIF with ACR in order to
get rid of the extreme vignetting. After initial alignment I did a rough
manual exposure adjustment to get the brightness of all images
approximately fitting. Shooting such high contrast scenes in automatic
exposure mode is never a good idea.

[Philip Chong]

Hi Bill,

I test out your photo.  I would shoot in manual exposure, lock the ISO at 100, look for a medium exposure( this take practice, always on the underexposed side) and lock it using the shutter speed.  Lock the temperature too.

For this edit, I did simulated brackets, did manual exposure blending, did color range and fill the zenith.

I sold my Mavic 3 and have the Mini 3 now, very happy. 

Here's what I try my best :  https://kuula.co/post/5WL5m

[PTGui Support]

Hi Bill,

I tried your images in PTGui 13. You just need to enable tone mapping
(see the side bar in the panorama editor). Philip's result is better but
I got a good result from your DNG images, without any tweaking.

I think using automatic exposure is fine in this case, it increases the
overall dynamic range. PTGui can handle this by compensating for the
differences, see my previous reply.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

> http://www.erik-krause.de <http://www.erik-krause.de>

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[Bill Miller]

Erik, Phillip and Joost, Thank you all for your suggestions, your effort to stitch this pano and for your time! Ive learned a lot and look forward to improving my images. Enjoy the weekend.

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