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Hi Emma,
I understand your confusion with the suggestion to change the image size in photoshop. I think that most of us that have had the 72ppi for screen and 300ppi for print drilled into us and miss that resolution is a little abstract in the sense that what we are really looking at is ppi or pixels per inch.
What is at issue is that the image that Stager creates is 72ppi, but that is arbitrary in the sense that what you are really doing in Stager is creating a pixel dimension. For example in the properties you might set the pixel dimensions to 4,096px x 2,736px. And yes, this render will come out at those dimensions at 72ppi.
What this means is that when you open it up in photoshop what you have is an image that measures 56.889in x 38in at 72ppi. Clearly this is not what any of us want for a print piece.
When you change the resolution to 300ppi in photoshop, you do not want to "blow it up". Meaning DO NOT select the option to Resample. If you "Resample", then you change the actual pixel dimensions and not the resolution.
As you can see here, changing the resolution from 72 to 300ppi really changes the document dimensions from 56.889in x 38in at 72ppi to 13.653in x 9.12in at 300ppi WITHOUT changing the actual pixel dimensions of 4,096 px x 2,736px, therefor no loss in quality because you are not actually changing the pixels at all. Just the reference information on the resolution of the file.
All that said, I do agree that this is a common misunderstanding of how resolution works and that Adobe could easily provide a resolution setting so that it is easier to accurately create pixel dimensions for print files than memorizing that an 8.5 x 11 at 300dpi is a pixel dimension of 2550px x 3300px. Becasue I am nuerodivergent and math impared, what I do is take the dimensions that I want to print my render at and create a blank document in Photoshop at those inches at 300dpi. Then I take the pixel dimensions and use that for defining my output size in px in teh properties in Stager.
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