Hello everyone, is there a way to open and process compressed dng files with rawtherapee?
I’ve created files because I was not concerned with failures from compressing pics but I wanted to take advantage of the color range instead.
Many thanks, Michael
Which version of rt do you use?
Hi, it’s the current one. I can open uncompress dng, but not the compressed ones.
So it’s a 5.0 version? Can you upload a sample file to filebin.net and post the link here?
fwiw, if you create a compressed dng with Adobe dng converter, then RT can’t open it. actually, it doesn’t even appear in the browser. last time I checked (a few months ago) the dcraw code was #ifdef’d out (though I might remember wrong)
@agriggio You are correct 
Currently rt only supports compressed float dng files
You’re right. Alberto, the file won’t appear in the browser. Do you know whether there are plans to get it back in?
I used the DNG converter. I have scanned lots of pictures and want to preserve the colors. Artefacts from compressing is not that much of concern for me.
Hi, here are three pics: the CR2, the uncompressed DNG and the compressed one. But I guess we won’t need them any longer.
https://filebin.net/d3341s9rjr0cqlkd
I don’t know of any plans, sorry. In fact, I’m not even sure why the code is commented out. I just tried a quick hack to put it back in, and it seems to work fine on my machine (warning: with only very limited testing). Here is the patch if someone is interested.
Maybe some of the RT developers know?
lossy-dng.patch (1.1 KB)
@agriggio Thanks for the patch. I tried it and it works fine. Don’t know why this was disabled and when. Must have been before my time Can you make a pr for it to get more tests?
@heckflosse sure, let me polish the code a bit and I’ll open a pr.
1 Like
You guys are incredible! Thx!
Hi, one question please: what is the process for a pr? Is there something I would have to do?
A PR, or pull request, is a workflow feature in github/github-like source hosting systems. You can read about it here: https://help.github.com/articles/creating-a-pull-request/
@Michael2 You don’t have to make a pr. Alberto already did and also fixed the issue It’s already in current rt code. You only have to wait for a new build.