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I'm an amateur photographer with very little experience, but today I saw a notice calling for photo submissions for an exhibition in my town and I'd like to send some photos I took. But they have some requirements regarding the file's properties, and I know nothing about it. The requirements...

Hi, Sorry if this is a silly question. Sometimes when I'm looking at how sharp my photos are, I zoom in and look of course. I usually know what's "sharp enough" I suppose. Aside from that though, how do I know if the quality of my image is good? Some photos I take will look great when they are...