Mike Chaney's Tech Corner
June 16, 2024, 12:35:17 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: Qimage registration expired? New lifetime licenses are only $59.99!
 
   Home   Help Search Login Register  

Professional Photo Printing Software for Windows
Print with
Qimage and see what you've been missing!
Pages: 1 [2]
  Print  
Author Topic: Qimage cannot display the preview images for some files  (Read 5824 times)
Just_user
Newbie
*
Posts: 36


View Profile
« Reply #15 on: March 19, 2022, 08:22:17 AM »

I'm sorry, but I don't agree that Lightroom can save a stitched panorama as a TIF.
Firstly, when saving a panorama, there are no options, as well as no dialog itself.
I myself always save from Lightroom - either to TIF or JPG (using presets only) and have never used DNG - and therefore Lightroom - didn't "remember" anything about DNG.

I can quote a link from the Adobe online help, where it says that when a panorama is saved, it is given the suffix -- Pano.dng :
 - source -- https://helpx.adobe.com/lightroom-cc/using/hdr-panorama.html
"Once you've finished making your choices, click Merge to create the panorama photo.
By default, a stack containing your source files and the merged photo is created, with the merged panorama visible on the top of the stack.
A suffix Pano. dng is appended to the filename of the merged photo."

Those. when saving a panorama in Lightroom - there is no choice of file format, alas
At least for Lightroom 6.14 (last stanadalone version)
Logged
admin
Administrator
Forum Superhero
*****
Posts: 4149



View Profile Email
« Reply #16 on: March 19, 2022, 01:28:06 PM »

I always looked at the DNG as an intermediate step: an intermediate storage unit where Lightroom stores the panorama for later editing (hence why it's called a "stack").  In other words, the result of the panorama function is stored in a DNG file so that you have LR's raw developing capabilities for the panorama.  In most cases, people will then open the resulting panorama (the DNG file) in LR and edit it for final printing.  You usually need to check/edit it for exposure, highlights, shadows, etc. once all the frames have been put together and crop out the "wobbly" edges on the top and bottom.  At that point, you save a final TIFF of your panorama.  I would say it is uncommon for people to take the raw output from the panorama command and try to print it.

Mike
Logged
Just_user
Newbie
*
Posts: 36


View Profile
« Reply #17 on: March 19, 2022, 02:35:34 PM »

Totally agree with you.

I actually do just that - I use DNG only for intermediate storage, as the 1st panorama source file.
But I have to keep it for the same reason. It is stored in the folder with subsequent panorama options in TIF format.
But thus, being in the folder with TIF files, as I wrote above - some DNG files - are not displayed in the Qimage program,
I'm afraid that they can therefore cause the program itself to work incorrectly ... And when you can't see their preview - it's somehow "annoying".

Therefore, if it is possible to eliminate this behavior of some DNG files - that would be very cool and big thanks to you!
Logged
admin
Administrator
Forum Superhero
*****
Posts: 4149



View Profile Email
« Reply #18 on: March 19, 2022, 10:27:58 PM »

Agree.  I've been working on the DNG problem behind the scenes.  So far, it looks like the LibRaw module that I'm using is just not designed to handle DNG files with that many pixels.  When I trace the loading of your ~24,000 x 5,000 pixel DNG files, LibRaw eats 1.6 GB of RAM on the load which (in a 32 bit process) leaves not much left to decode it.  A 24,000 x 5,000 pixel image should only use about HALF that amount of memory even with a 16 bit/channel full color linear DNG.  The strange thing is, it doesn't seem to run out of memory even at 1.6 GB of RAM used, but it returns an null image (0x0 resolution).  My only conclusion is that the DNG module wasn't designed for anything other than single raw shots.

I've emailed the company who makes the DNG support module and will see if they can find anything.  In the mean time, maybe you could just save your TIFFs in a folder separate from the DNG's so Qimage won't try to read those large DNG's along with the TIFFs.

Regards,
Mike
Logged
Just_user
Newbie
*
Posts: 36


View Profile
« Reply #19 on: March 20, 2022, 11:41:54 AM »

Clear.
Thank you for your clarification and for not disregarding my request..
I agree that the DNG and TIF files will have to be "spaced" into different folders so as not to create problems for Qimage.

Thanks again...
I hope this problem can be solved.
Logged
Pages: 1 [2]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!
Security updates 2022 by ddisoftware, Inc.