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Old 24-03-2016, 12:45 PM
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janoskiss (Steve H)
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Join Date: Jan 2005
Location: Sale, VIC
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Quote:
Originally Posted by thegableguy View Post
ISO invariance, to summarise, basically means that you can underexpose a shot by several stops and not lose any detail (how many stops largely depends on the bitrate). It's explained reasonably well here:

http://improvephotography.com/34818/iso-invariance/
You must have been typing your message while I posted mine. Yes I've read the article but I'm skeptical for reasons I stated in the above post. I can already do this anyway if I'm happy with 8-bit colour. Shooting at ISO 200 and then upping the gain in post processing by a factor of 8 will give me a virtually identical result to shooting at ISO 1600 = 8 * 200. (I don't actually use a "factor of 8" in practice; that's just theoretical; I just contrast-stretch/normalise each photo.) And that works because I have 4-bits to spare between 12-bit RAW and 8-bit final. So I could even go as high as ISO-3200-equivalent from ISO 200.
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