DNG Files - view thumbnails in Finder

Found the problem!!! Here's an extract from Reeflex:

The issue is related to the fact that Pro Camera does not embed a thumbnail in the DNG file. We intentionally did this to not confuse users, since if a thumbnail is present, the Photo’s app will only show the JPG preview and you only access the RAW data if you try to edit. 

In previous versions, this was not a problem in the Mac’s finder, as it could still generate the thumbnail on the fly. On newer version, this feature was removed.

It is an easy fix for us, so you can expect us to solve this problem in one of the next updates. Maybe we will include a toggle in the App’s settings, to let user decide if including a thumbnail or not in the DNG. 

Richard.Taylor wrote:

It's sounding like the DNG files that these apps are creating are incomplete. I wonder if sending then through Adobe's converter (which seems to have no effect at all on my Lightroom DNGSs) would create new thumbnails.

How's Photometer? I haven't tried it. The unique thing that I'm using in Lightroom is the AI Noise Reduction--it's fabulous. I'm taking pictures at ISO 12000 and more, and Lightroom makes them presentable.

https://discussions.apple.com/content/attachment/4572fddc-8128-4823-9590-fdf378fe0553

Early in the morning. I can't believe how crisp it is!

Hi Richard, the native camera app dng’s work fine. The problem files from the 3rd party apps are shot in RAW and converted to DNG by Photos app when exported to my file system. Lightroom DNG’s are fine but having used Lightroom Classic for years I never had a need to use Finder for file handling. Now I have ditched Adobe for Apples alternatives (Photomator).Had a few online support calls with Apple and it now appears that there is actually a thumbnail there, but not the whole image, just a black square with some random pixels. If I click quick view it shows the thumbnail.

Various apps refers to Reeflex Pro camera, Reexpose app and Adobe Project Indigo camera. They are all DNG format which is the same as those exported in Photos as originals taken by the native camera app.

The weird thing is that all the Apple apps read and display the files properly, but not Finder. I’ll have go at the Adobe converter to see if it can make a difference. Photomator is great so far, not yet a true Lightroom competitor, but maybe Apple will improve it (or kill it like Aperture). Photomator also has an AI denoise feature, haven’t given it a proper test yet, but doubt it’s up to Lightroom’s. Nice image!