In Lightroom CC, I'm working with *.jpg files imported from a cell phone (Samsung Gallaxy S9), not RAW files.
I've made changes inside Lightroom and go to export my images.
(Q) What quality should I use when exporting to maintain the same quality as the original jpeg image?
My desire is to not introduce artifacts or decrease the quality nor make the file significantly larger.
I would have thought Quality = 100 to get the best quality, but in some quick tests the file size grew instead of remaining roughly the same size as the original. I'm not sure what this means if anything.
In the tests that I did the changes were simply crops so they should have resulted in smaller files than the original.
I searched for an answers and found these links helpful:
Does JPEG-to-JPEG export Lightroom reapply compression? - Asks if an original image is Quality 80, and it's changed and re-exported, should the 2nd export be "Quality 100" or "Quality 80".
Google Search for
lightroom exporting jpg images what quality should I use?- Interesting article that explains lighroom export's quality works in bands where 93 to 100% were identical, 85-92% were identical. So interesting article, but it did not answer my question.
Google search for
Does jpeg file store the quality used when compressing it?but nothing useful showed up. If the JPEG standard stored the compression technique and values used to generate the image than it might be possible to lookup the original compression used and use the same value when creating the exported jpeg file.
What quality should I use for JPEG?says: In general, quality 90 to 100% and higher are
high quality, 80-90% are
medium qualityand 70-80% is low quality. Makes complete sense (not!).
In my case, I'm dealing with images taken from a cell phone so I'm not sure of the original "Quality" of the JPEG image.