PTGui not recognizing HDR exposure sets

[jstu...@goldeneraproductions.org]

Fast question: I shot a pano with bracketed exposure sets of 5 images each.  My horizontal series of shots was 7 sets of 5.  My zenith was 8 sets of 5.  My nadir was 7 sets of 5. Don't ask why the discrepancy: I don't remember what happened.  These images are not 100% sequential and by that I mean that between the last zenith image and the first nadir image, there is a large gap in file numbering: The zenith exposure sets ending at _0075.tif and the nadir exposure sets starting at _0116.tif.  Aside from that, each set is a full sequence unto itself with no missing file numbers.
PTGui rejects these images insofar as not recognizing the exposure sets.  Meaning, if I load them all at once, I am told that PTGui recognizes no exposure sets.  But if I load only the horizontal set, PTGui DOES recognize the exposure sets.  And then if I add the 8 sets of zenith images, it also recognizes them and adds them to the existing (horizontal) exposure sets. When I then proceed to add the nadir set, this is where the trouble starts.  PTGui, when instructed to "Link HDR..." in the Image Parameters tab returns a message saying that no HDR exposure sets were recognized.
If I then go back and load images _0076.tif through _0115.tif (which comprise 8 separate HDR exposure sets with the camera pointed directly up - a total overkill, admittedly), PTGui still doesn't recognize any HDR exposure sets. This seems to rule out that PTGui is taking issue with the missing images.
I did separately load the nadir images into their own project just to see what would happen and lo and behold, PTGui recognizes them as an HDR set and links them.
Any ideas??

[jstu...@goldeneraproductions.org]

Never mind.  Somehow the aperture was changed from f16 to f18 on the nadir shots.  No idea how.  That's why PTGui doesn't recognize them when they're combined with the others.  And that's why I'm getting weird density shifts in the nadir range when I stitch it together.

[Rasid Winklaar]

Hi Ekbmuts, I am having the same issue you thought u were having. I have a nikon d5500 I cant manage to get the exposure sequence, for example 1/25 1/100 1/400 to create HDR in Ptgui. I have tried for hours! hahaha, would you mind guiding me through this issue?

[John Houghton]

On Tuesday, August 9, 2016 at 3:21:33 PM UTC+1, Rasid Winklaar wrote:

Hi Ekbmuts, I am having the same issue you thought u were having. I have a nikon d5500 I cant manage to get the exposure sequence, for example 1/25 1/100 1/400 to create HDR in Ptgui. I have tried for hours! hahaha, would you mind guiding me through this issue?

Check on the Image Parameters tab that you have an exactly repeating exposure sequence for all of the images.   eg. 1/25, 1/100, 1/400, 1/25, 1/100, 1/400, 1/25, 1/100, 1/400,....., with a constant aperture and ISO setting.  If so, you should be able to link the images with the button at the bottom of the table.  Linking is appropriate if you used a tripod so that the camera's position was the exactly the same for each image in the same bracketed set.

John

[ekbmuts]

Sorry for the delay Rassid.  I don't check this forum daily.

In any event, I think you may not have your camera in MANUAL mode, which is mandatory.  Your exposures have to be exactly repeating for PTGui to notice them.  If your brackets are not identical in terms of exposure, PTGui isn't interested.

In my scenario, somehow the aperture changed mid-shooting.  Lord knows how.

Jon

[Goholidays]

You can get round this, and if there is little discrepancy between the exposures the effects will be minor. Load the images in, the go to 'Image parameters' and edit individually the shutter speed and/or aperture so the sequencee for each shot is sequential. Then, in 'Set up panorama' on the Project Assistant tab you should be able to click 'enable HDR mode', then align images and output the pano.

[PTGui Support]

Hi,

You're replying to a post from 2016. Today, PTGui Pro 12 no longer has
any problems with HDR panoramas taken in automatic exposure mode. You
don't need to edit the shutter speeds as you describe.

The only thing you may need to do is to link your bracketed exposures
manually, in case PTGui doesn't recognize the repeating exposure sequence.

For more information see:
https://ptgui.com/kb/101

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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