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Trying to explain to a family member that the colour present in images of DSO's isn't actually how it looks, merely so that our eye cells can perceive it is frustrating
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Perhaps an image from Chandra or Spitzer, then point out that one is an image in the X-rays (Chandra) while the other is in the Infra-Red (Spitzer) neither of which we can see with our eyes. That way they may realise that "false" colour is added to imply other aspects. Mention that even the visible band imaging scopes can/will have the colour altered. Alternative is images of M42, they come in all shades/colours. They cannot all be real.
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Lots of them are real colours. Many of us imagers spend a lot of time striving for a correct colour balance. Narrowband images are often false colour, but that's because they often use the emission of sulphur as red, which it is, but then also use hydrogen alpha as green, when in fact it's also red. Not all NB images are false colour though...I try to keep mine as close to natural colouring as possible.
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