Overexposed panorama

[janrol...@gmail.com]

Hi! Have been taken some panoramas with my new drone, Mavic 3 pro. In Lightroom the images looks good, with good exposures. But when I stitch the images in PtGui, it get very overexposed, especially the images where the sun is. The difference is very notable. Also when I look at the source images in PtGui, there is a notable vignetting in all images, but that can not been seen in Lightroom. I have attached two images, one is the original image as seen in Lightroom, and the other is how it looks when stitched in PtGui.

[Erik Krause]

Am 03.03.2024 um 22:14 schrieb janrol...@gmail.com:

> But when I stitch the images in PtGui, it get very overexposed,
> especially the images where the sun is.

Ptgui needs to adjust the brightness of images to match the brightness
of adjacent images. That's why you should never shoot panoramas in
automatic exposure mode. I assume that's what’s happening here.

> Also when I look at the source images in PtGui, there is a notable
> vignetting in all images, but that can not been seen in Lightroom.

Did you feed the raw images to PTGui or the converted ones? PTgui
doesn't know about the corrections lightroom applies. It's always better
to use the converted images (convert to 16bit tiff), especially since
drone images often suffer from special vignetting, which is not
correctable by PTGui.

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

[John Houghton]

On Sunday, March 3, 2024 at 9:14:19 PM UTC janrol...@gmail.com wrote:

 when I look at the source images in PtGui, there is a notable vignetting in all images, but that can not been seen in Lightroom.

This is a known issue that was reported back in 2022. It is my understanding that this was fixed by a firmware update to the drone.  I don't have a drone so I cannot advise on the technical details.  Please update to the latest f/w and let us know if that fixes the problems with the raw images.

John

[PTGui Support]

I think it's likely due to shooting in auto exposure mode, as Erik says.
If some images are longer exposed than others, PTGui will use the
average exposure.

You can dial down the exposure in PTGui in the Post Processing side bar
in the Panorama Editor.

Or you can disable 'Exposure Compensation' in the Blending side bar.

Most DJI drones exhibit strong vignetting, but Lightroom applies a
correction by default. PTGui can correct the vignetting to some extent
if you go to Exposure/HDR and press Optimize Now!. You might want to
convert your DNG images to TIFF before stitching for the best results.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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