Welcome to the forum. Where were you even able to find a RawTherapee distribution that old?
Possibly. Of course, that would require someone to actively look for 2.4.
It turns out that 2.4.1 (close to 2.4) is still on the downloads list at
RawTherapee - Downloads, where the fact that this release is almost 12 years old.
I’d be interested to know where the OP got their copy of 2.4, in case there is some site out there somewhere actually offering 2.4 as current software.
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Thank you for the tip! It’s working! But the last 20 picture are still in the old platform of RAWTherapee!! I don’t know why!! And I don’t know how transfer them in the new!! 
When I save one for example RAWTherapee save in png and so don’t change !! Still black and violet !! Can you help me?? I don’t know what there aren’t anymore colors in this picture
Delete all .pp* files of the images which are not shown correctly and open the images again in RT 5.8
Hi! Thank you so much. The nroblem has been solved 
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Btw: I just downloaded 2.4, which also was the first version o RT I used
I started contributing to RT much later (in 2013)
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I remember reading documentation or a tutorial for some ancient version of Rawtherapee, and was amazed at how rudimentary the tools seemed. Lots of progress.
I even remember downloading it in 2014, to process some CHDK raw files on my Canon point and shoot, and was amazed at how terrible they looked with neutral processing, and learned how much internal processing the camera was doing, to correct all the crazy barrel distortion, as well as loads of noise. At that point, I was a 15 year old overwhelmed with options, and I gave up until I got my first DSLR for Christmas that year, and began to learn how to get good results using Rawtherapee about then. Even in early 2015, it had no good tone compression algorithms, nor wavelets, so I ended up learning how to blend masked curves in an external pixel editor very early as a result.
Nowadays, Rawtherapee is very powerful, and I find myself only doing editing in an external pixel editor maybe 10% of the time, 4% if you exclude panoramas.
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Me too. It seems like linux/foss people like their acronyms.
For instance, GIMP stands for GNU Image Manipulation Program.
Then you extend out the GNU acronym, and you get:
GNU’s Not Unix Image Manipulation Program
Extend out GNU again, and you get:
GNU’s Not Unix’s Not Unix Image Manipulation Program,
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
And do it again,
GNU’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix’s Not Unix Image Manipulation Program
Ok, after 20 iterations done with a Python loop, the point has been made.
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Here’s a bit of ancient history for you: back in the days I managed a Dutch/Belgian community of PCLinuxOS and did Dutch-language remasters as well as the DPE (Digital Photography Edition) of PCLInuxOS - a remaster filled to the brim with image editing stuff and by special permission from the master himself (Gabor) also RT in one of its earliest versions. It was not yet open-sourced at that time yet but Gabor Horvath graciously allowed me to include the binary on the PCLinuxOS DPE.
Read more about it here: https://pclosmag.com/html/Issues/201005/page11.html
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Perhaps we should mention this somehow in rawpedia… Just a thought…
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Did the main Rawtherapee contributor back in the day use a nick containing Dr? Or am I confused?
No
DrSlony?
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Thats the one! Another software?
Not since 2011. Usage of that acronym lead to justification for inclusion of arcane tools which were so convoluted as to not be practically useful, so the acronym was dropped in 2011.
https://code.google.com/archive/p/rawtherapee/issues/885
There still are arcane tools and sliders, e.g. “ΔØ Mask Laplacian solve PDE”, but at least the software name can no longer be used as justification for their inclusion.
Yes, I most certainly agree with that. After all these years this is quite the discovery and now makes so much more sense what the therapee bit about it.
I always thought it of it as it’s the treatment you need for raw files, which probably plays nicely into these clever unix recursive acronyms and word play.
I wonder if the word experimental still fits. RT is quite the raw editor these days. I guess keeping experimental in there allows for more new and interesting capability to evolve? Tracking dev right now certainly highlights the development and interesting evolution of algorithms etc 