I order prints of my pictures from an online place that has a number of scaling options. I upload JPGs. They have a number of paper sizes, 17x22, 18x27 etc. I do not understand the "no scaling" option. A jpg does not have a physical size, does it? I mean, if I created a photoshop document at 24"x24" and save it as a jpg, that jpg is not 24"x24" is it?
And the "use smaller image" confuses me too. In order for that to make sense, I would need to know the pixel dimensions of the print job, right?