High on the Mountain Top
Join Date: Jan 2004
Location: North Vancouver, BC, Canada.
Interest: Mountain biking, hiking, nature photography, astronomy, music...
Digital images store colours as red green and blue values between 0 and 255. Zero is black, 255 is the maximum intensity of that colour. It sounds like a particular pixel is stuck at 255 in the red channel. It's easy to find these by taking a photo with the lens cap on. It's very common, and most cameras have at least a few. It disappears when the photo size is reduced because that particular pixel is then mixed with surrounding pixels. They typically dissapear when you print them too.