Over time, every digital camera will develop “hot” or “stuck” pixels that do not work properly. They aren’t usually visible, but when you’re taking long exposures, they become more and more obvious. The easiest way to fix hot pixels is with a camera setting called long exposure noise reduction.
What Are Hot Pixels?
Hot pixels are bright, colorful pixels in your photo that don’t match with the rest of the image. You generally cannot see them until you magnify a photo 100% or more on your computer. When you do, they often look like small crosses that are brightest in the center.
This is only a snippet of a Photography Article written by Spencer Cox
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