JPEG will corrupt image quality if you repeatably opens and save the file. Your quite right in some off you assumptions.
It has helped me a lot in getting better with Darktable. Regards and thanks also for the excellent knowledge I see in the forum. So bearing in mind the limits of quality in an imported RAW file from this platform what might one do different to insure highest jpg results? I really want some new glass and a new(er) body but given prices and the fact that I am retired and have a limited budget that wont happen quickly. So to export the highest quality jpg what should settings in export be? Another thing to consider is that I am shooting an Olympus OMD EM5- original version that I purchased in 2012 along with its Olympus 12-50 3.5-6-3 kit lens. I run my workflow where if I want changes in a shot after the first edit and export to jpg go round (and this is frequent that I do) I go back and make changes in the RAW file which is saved in archives in my workflow and then re export it. From my understanding jpg is lossy with further editing. I also understand that under format options earlier in the export panel one has the option to choose 8 bit jpg and a number of others. Should these be set to yes for higher quality jpg results? Also there are a plethora of other selections under profile, intent and style. I also note that both upscaling and high quality resampling default to "no" when left alone. I am assuming that the additional file size and quality might show up in what-a really large monitor or in printing or? I was expecting with a file size roughly 10 times larger for the same image developed from ORF and the same processing- only changing the quality slider, that there might be some discernible "oh wow" difference but i just do not see it. Bear in mind that I run a pair of BenQ 24" monitors, several years old, on the machine I do my editing on. In viewing them side by side I can not see any marked difference. Exporting to jpg at 90% quality might yield a 1.4 MB file where moving the slider to 100% yields a 14 MB file. In the export settings under jpg 8 bit the quality slider goes from 0 to 100. I shoot RAW- Oly ORF, import that to Darktable and make the changes I want in each photo.
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