Blown highlights in HDR

[Juan Navarro]

Hi all. I occasionally bump into this issue where ptgui doesn't seem to do HDR quite right.

This is the HDR image that ptgui produces out of 5 exposures, with default settings:

This crop shows the snow blown out and unrecoverable even if I export a 16-bit tiff.

There's enough bracketed exposures for ptgui to have done a better job. Here's a crop of the -2.3 EV exposure:

If I significantly reduce brightness in the panorama editor's tone mapping tab, I can get the snow fine, but then the shadows get unrecoverably dark.

Is this expected? Disclosure: I'm somewhat new to HDR.

The source files are here: https://nandu.world/misc/ptgui/

Thanks!

Juan

[Erik Krause]

Am 11.08.2022 um 15:38 schrieb Juan Navarro:

> The source files are here:https://nandu.world/misc/ptgui/

I did a raw conversion to 16 bit TIFF in ACR with all adjustments set to
0 and loaded the results into PTGui. Applying tonemappping in Pano
Editor Blending side menu and playing with the parameters I saw that the
complete dynamic range is available. However, PTGui somehow fails to
produce a good result, there is always a bit of haloing (in tonemapping)
or slightly washed look (in exposure fusion).

That's where SNS-HDR excels: attached is the result of SNS-HDR lite with
the natural preset.

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

[Philip Chong]

I do luminosity masking.  It is so powerful. Better than any HDR software.