Re: Projection glitch after DNG edit and export in Lightroom

22 views
Skip to first unread message

Erik Krause

unread,
Sep 22, 2024, 3:29:59 PMSep 22
to pt...@googlegroups.com
Am 22.09.2024 um 19:45 schrieb Arnaud Pladys:

> If I import this DNG back into Lightroom for editing and then export a TIFF
> with an alpha channel (or without), I have a file with the same pixel
> dimension. However, somehow, when I open it in PTGUI (or PTGUI viewer), it
> wraps incorrectly.

Many raw converters shave some pixels from the border of raw images.
This is camera specific and should be specified in the EXIF data, so
perhaps there is something wrong.

Perhaps you could create a smaller example and provide the original
PTGui output DNG for download here. Use wetransfer, dropbox or similar.

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

PTGui Support

unread,
Sep 23, 2024, 4:19:27 AMSep 23
to pt...@googlegroups.com
Hi Arnaud,

Since the last beta, PTGui includes the 'uniquecameramodel' tag in the
DNG output. I think this fools ACR to treat the image as an actual
camera raw file, overriding/ignoring the metadata, and (as Erik says)
cropping off the edge pixels.

Could you share your project and source images with me so I can
investigate? Please share with sup...@ptgui.com via wetransfer, google
drive or similar.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 22-09-2024 20:29, Arnaud Pladys wrote:
> 2nd update: the issue is coming from Adobe somehow (photoshop or Lightroom).
> I had this hypothesis, so I downloaded RawTherapee. Indeed, if I open
> the DNG with it and convert it to JPG, there is no issue in the PTGUI
> viewer afterward.
> Somehow, the DNGs outputted by PTGUI have strange issues after editing
> with Adobe. I've tried converting the DNG using the Adobe DNG converter,
> but I have the same issue.
>
> Le dimanche 22 septembre 2024 à 19:55:25 UTC+2, Arnaud Pladys a écrit :
>
> Additional info: If I open the DNG again in PTGUI and save it as a
> jpg, it also creates a file of 20358x10179 pixels. This jpg opens
> fine in the PTGUI viewer without the strange glitch. What's going
> on? It feels like bad magic, haha!
> Le dimanche 22 septembre 2024 à 19:45:00 UTC+2, Arnaud Pladys a écrit :
>
> Hi,
>
> I've processed my 360x180 sphere in PTGUI using DNG input for
> the first time,  then saving as DNG.
> The DNG file is ok; the projection is perfect if I re-open it in
> PTGUI.
> If I import this DNG back into Lightroom for editing and then
> export a TIFF with an alpha channel (or without), I have a file
> with the same pixel dimension. However, somehow, when I open it
> in PTGUI (or PTGUI viewer), it wraps incorrectly.
>
> This issue is quite perplexing, and I'm struggling to identify
> the root cause. I'm hoping that with your expertise, we can
> figure out where this is going wrong. Your prompt assistance
> would be greatly appreciated.Screen Shot 2024-09-22 at
> 19.43.28.jpgScreen Shot 2024-09-22 at 19.43.53.jpgScreen Shot
> 2024-09-22 at 19.44.20.jpg
>
> --
> You received this message because you are subscribed to the Google
> Groups "PTGui Support" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to ptgui+un...@googlegroups.com
> <mailto:ptgui+un...@googlegroups.com>.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/ptgui/68dfd9ce-78bd-466d-b354-a6f41487ead4n%40googlegroups.com <https://groups.google.com/d/msgid/ptgui/68dfd9ce-78bd-466d-b354-a6f41487ead4n%40googlegroups.com?utm_medium=email&utm_source=footer>.
Reply all
Reply to author
Forward
0 new messages