Forgive my ignorance, but I know of nothing of photography or DPI or any of that. But I need to submit a photograph to accompany a 1/4 page advertisement in a newspaper. (The photo will run in black and white.) It must be submitted via email. I'm told the photo must be 300 DPI. I have an iphone 8. Can I take the picture on my phone and just send it in, or are special steps and/or a different camera needed?