Issues with Sky blending

[Marc Pasco]

Hello PT guys

I need some help on this. I get very often some strange patterns while making HDR panoramas. It looks like the different exposure bracketing images don´t really blend together softly creating a visible pattern.

Then I have a much brighter "North Pole" of the image what is defenitely wrong. The atmosphere in top of my position is much thinner and the sky should look darker and not brighter than the rest.

Is this a poralization issue maybe ? I used LightRoom and RAWTherapee to even the lens vignetting and merged in photoshop all images to an HDR and blended 17 HDRs to the image you see attached to the message. I tried also to to this with single images so no merging with Photoshop but I got the same result...

Any ideas?

THX ! 

[Marc Pasco]

[Erik Krause]

Am 11.02.21 um 12:27 schrieb Marc Pasco:

> Is this a poralization issue maybe ? I used LightRoom and RAWTherapee to
> even the lens vignetting and merged in photoshop all images to an HDR and
> blended 17 HDRs to the image you see attached to the message. I tried also
> to to this with single images so no merging with Photoshop but I got the
> same result...

Looks like the zenith image is simply lighter. You can do exposure
optimization on Exposure/HDR tab or manually decrease the brightness for
the relevant image on Image Parameters tab (Exposure Compensation column).

--
Erik Krause

[Marc Pasco]

"Looks like the zenith image is simply lighter."

That would be weird as all images were shot with exact the same settings; 9 images with exposures from -5 EV to +5EV. White Balance, Focus, set to manually

[John Houghton]

On Thu, Feb 11, 2021 at 12:41 PM Marc Pasco <mpas...@gmail.com> wrote:

"Looks like the zenith image is simply lighter."

That would be weird as all images were shot with exact the same settings; 9 images with exposures from -5 EV to +5EV. White Balance, Focus, set to manually

.... and were the actual exposure times/aperture settings/ISO settings the same in each bracketed set?  I.e. shot in manual exposure mode, not Av mode.

It cane be useful to select Unblended mode in the Panorama Editor window to reveal exposure differences between images more clearly.

John

[PTGui Support]

Hi Marc,

It's probably because you are tone mapping before stitching. Each image
will come out with a different brightness, depending on what's in the frame.

Try switching the panorama editor to 'Unblended' mode to see if this is
indeed the problem. You'll want all frames to have approximately the
same brightness.

It's better to do tone mapping as a final step after stitching. Check
out the HDR video tutorial on the PTGui website.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Philip Chong]

Are the darkness cause from the dark corners of the camera?  Do lens correction/vignette  first?

[Erik Krause]

Am 11.02.2021 um 19:16 schrieb Philip Chong:

> Are the darkness cause from the dark corners of the camera? Do lens
> correction/vignette first?

PTGui will correct for vignetting on Exposure/HDR tab (and better than
any raw converter does). Press "Optimize now".

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