Re: What is 500K or less in pixels?
Look in your computer where you have the image stored and check what the directory is saying for the file size. For Windows, just use "My Computer" or Windows Explorer, and though I don't use a Mac, I know you can find the same info. If the file size is less than 500k (k=1,000 - "kilobyte") it should be okay, unless the specs for the comp also give an image size of so many pixels by so many pixels which your image also must meet.
File size and image size are not the same thing. You can have an image that is 500 pixels by 500 pixels and have the file size be any of many different sizes, due to varying quality (compression) levels in jpgs, among other reasons.
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