Auto lighting optimiser and highlight tone priority

Started Jan 2, 2013 | Questions thread
Karl Gnter Wnsch
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Re: Auto lighting optimiser and highlight tone priority
In reply to DigitalNick, Jan 2, 2013

DigitalNick wrote:

OK, I guess my question was do either of these tools affect the RAW image capture at all (for example, does 'Highlight Tone Priority' just under-expose by say 1/3 stop and therefore affect the RAW capture)?

It's worse than that. ALO does nothing to the RAW but influences the way the camera meters to a small degree. HTP on the other hand is a major change in the way the amplifiers on the sensor are operated (bright areas are less amplified by one full stop) - and it's one that LR can't properly handle.

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Karl Günter Wünsch

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