pia wrote:A lot of great questions and very helpful answers on this forum!
Edit
I realize I've been using 960 X 720 pixels which is over what you suggest. I too am a technological neophyte and am just wondering if that is too much for photos? The reason I use the 960 X 720 is because that is what the Cambridge Art Association requires for photos of paintings, mixed media submissions, etc.
There is nothing wrong with uploading large images such as 960 X 720. And you are right; many sites require it. As long as your images are not to large, like 2400 pixels, you should be fine. You figure acceptable print resolution is about 150 pixels per inch. Good quality is well over 200, perhaps 240-300. So if you you had an image that is 960x720, the largest size high quality image someone could produce would be 4x3 inches. That would not be very useful to someone interested in stealing your work. Otherwise, they will be printing your image larger, with not such good quality.
all the best,
Joe