I have been reading and reading about the relationship between pixels, PPI, image size and print size/quality and I'm still confused...
I want to export a high quality JPEG with the largest range of printing possibilities so the person that gets that JPEG can do whatever they want with it--print at whatever size they want and still get an excellent quality printed photo--whether it's 4x6 or 16x20 or whatever size (understanding that there would be crop issues when choosing a 4x6 versus an 8x10, etc). In reality, these pictures aren't likely to be printed at a huge size, but I want them to have that option. Original Raw files are 6000x4000, around 28mb. Edits usually involve only crop and small develop adjustments.
In Lightroom5, I used to export my raw to JPG at resolution 300 PPI (resize to fit NOT checked) and 100% quality per suggestions I heard somewhere along the line. I would get JPEG's somewhere in the 9-12mb size range.
In On1 2019.x, using the export module:
If I choose no photo size and just 100% JPEG image quality, this results in a JPEG around 6.8mb.
If I want to specify 300ppi, it appears that I have to select the photo size option, but then I also have to put in a photo size, in addition to the 300ppi. If I select photo size and put in 300ppi, it looks like it calculates the width and height for my pixels (since I cropped the image, it is less than 6000x4000) and my resulting JPEG is the same size as choosing no photo size (6.8mb). This JPEG file size seems small to me, making me wonder if I am not making choices correctly. And curious why 300PPI and 72PPI result in exact same file size--I clearly am not understanding the relationships!
If I select photo size, put in my original dimensions, 6000x4000 and 300ppi, I get a JPEG 10.9mb (which would be closer to the file size I am expecting based on my LR experience).
Suggestions on what my export settings should be for the best quality printing options?
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