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Yes it seems through testing that LR is in fact re-saving/exporting the DNG again when "Update DNG preview and metadata, with the lossless option.
Although I have found no documentation from Adobe saying that's whats happening and there is nowhere to change the compression option for the output.
Only thing that can be changed is the size of the preview thumb, in "preferences/File Handling". This setting will also effect the "Update DNG preview and metadata".

What is left in the dark is why the settings made in CR2HDR-Plugin change nothing in the output...

(Also noted that the plugin itself can not be placed in a folder on the Mac that contain any "-" (in my case "/work-adobe/LR/").
The plugin was able to load in LR and I can see it in Plugin Manager but it doesn't show up in right click context menu nor under "Presets" in the "File/Export menu" if the plugin is located in a folder with "-". Just put it in another folder and it will work fine. Hope it will help someone else with the same problem.

Please let me know when you had time to test the settings-not-doing-anything-problem.

Thanks!

Thanks Walter, (no pictures included?!).

So I guess the scenario I'm seeing is "Normal" then..
That files are being compressed lossless, when I write the adjustment/meta to the DNG with LR.
Even though I'm not doing any "DNG-export", just writing meta to the file?
At least that is my understanding what "Update DNG preview and metadata" command in LR will do (=update meta) or is this equal to "export"?

Also what I still don't understand is why there are settings in the C2RHDR-plugin (regarding compression) that have no effect on the outcome?

What is normal?

Settings in LR-plugin doing noting and file sizes being 44Mb+ and being reduced to half, just because I write new meta to them doesn't seem very normal..

Thanks for helping, but I'm stuck.

/Applications/Adobe DNG Converter.app
Is where my Adobe Converter sits.

I get no error msg from LR or the standalone CR2HDR app that something is missing. So I can't really tell where they are looking for the Adobe DNG converter. (If they don't find the converter, how can they still be making DNG files from the CR2?)

The LR workflow should be this right?

1. Export to CR2HDR - Get 22Mb something DNG file (depending on the options in CR2HDR plugin)
2. Do adjustments in LR to the new DNG
3. Update DNG preview and metadata (File is still 22Mb)


But this is what's happening:

1. Export to CR2HDR - Get 44Mb!!! something DNG file (regardless of settings in CR2HDR plugin)
2. Do adjustments in LR to the new DNG
3. Update DNG preview and metadata File is now 22Mb!!!!  (I did nothing to it but update meta and thumb after adjustments)

Or is this how it should behave? 
If so, then I don't know what the settings for CR2HDR do since they don't do much with the output..

It doesn't matter if i set DNG-compression in the LR-plugin to no-compress, -compress - compress-lossy.

The resulting DNGs all have exact the same size. 44Mb

If I just do an normal LR export to DNG (of course it won't cook the dual ISO) the file size of the resulting DNG is just 22Mb.

So I still don't understand...

Hi guys,

I'm running Mac and have tried both the standalone app CR2HDR.app (2.0 beta) and the LR plugin to convert dual ISO CR2 files to DNG. (5DMKIII V.123)
(dcraw 9.19 installed).

With the app it's just drag and drop and out comes a DNG, with LR I have tried changing the plugin options.
My problem is that my DNG files comes out huge. I run a (normal sized 27Mb) CR2 and the DNG converted is 44Mb.
In LR (CR2HDR-20 bit version)the option to embed original CR2 is disabled and everything else is also set to default. The .app has no options but the result is the same.

I have dl a couple of examples from others (both CR2 and DNG) and their converted DNGs are always smaller than the CR2
If i try to convert their CR2 my DNG is double the size.

What am I missing?