I understand that for web-viewing purposes, 72 DPI is enough for good resolution. However, when it comes to making prints for your artwork, you have to have it at least 300 DPI.
1. What would prevent people from changing the DPI to 300 using Photoshop, etc.?
2. This might be answered by no. 1 as well but, when do you specifically make an image high-res or lo-res, before saving your PSD to JPG/TIFF/etc? Or you can make it high-res or lo-res anytime you want?
3. Say you're being commissioned by someone for an artwork, how do you send them a high-res artwork? Do you send them the PSD file itself, or do you flatten your PSD image, save it as 300 DPI (or higher) JPG/TIFF/etc and then send that to them?
Sorry if they sound particularly noobish. I'm just concerned that I may be uploading high-res, printable images in the future and not know it. :/
Thanks for the replies!