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Originally Posted by aliferste
If strong light is going to affect it then surely scanning the photo willy nilly is going to make it deterioate faster?
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Yes if you were continuously scanning it, but it is a one off exposure to light. Realistically the light from a scanner is likely to be less than the exposure from leaving it in the sun for a week, (or possibly less). I'll work this out if you really want to know.
When a gallery gets a watercolour imaged or photographed, the professional will use flash but this is one day of flash exposure.
Compare to allowing visitors to use flash photography, on a popular image, this could mean 100 flash exposures a day 300 odd days a year. The sort of light level that would cause fading.