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Author Topic: Lightroom 12.3 - Denoise is there  (Read 7215 times)

Simon J.A. Simpson

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Re: Lightroom 12.3 - Denoise is there
« Reply #80 on: May 23, 2023, 08:33:45 am »

I'd like to see a photo since I'm still a bit confused.
In each case, there's a point of complete clipping right?
Maybe the term should be smooth clipping and abrupt clipping?

May be ‘clipping’ should be reserved for describing when the highlights are irretrievably lost and referring to what happens prior to this as ‘tonal compression’.

Andrew, I'm thinking about how best to show this with some pictures…

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Simon J.A. Simpson

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Re: Lightroom 12.3 - Denoise is there
« Reply #81 on: May 23, 2023, 08:40:47 am »

My example above was an oversimplification. Many things may be at play there. The signal may be "compressed" to avoid hard clipping, but this is only a possibility.

In any case, my point is that the "extra" headroom in the sensor is not available to use, at least not keeping a linear response of the whole system (sensor + ADC)

I think you’re right, that compression is being used prior to the signal being sent to the ADC.  This is how it works in the audio world, compress the high level signals prior to the ADC so that they don’t abruptly become clipped in conversion.  That’s the thing with digital, it’s either there or it isn’t  ;D.  I note that my little Sony RX100 has the tendency to abruptly clip the highlights.  I have to make sure I under-expose a little with high contrast subjects.
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digitaldog

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Re: Lightroom 12.3 - Denoise is there
« Reply #82 on: May 23, 2023, 12:27:20 pm »

May be ‘clipping’ should be reserved for describing when the highlights are irretrievably lost and referring to what happens prior to this as ‘tonal compression’.
IMHO, not maybe.
Now one of three (or four) channels may clip while the others do not but clipping is clipping.
It is outlined here: http://www.digitaldog.net/files/Langs_Render_to_Print.pdf but also referred to (and this may be a better term for full clipping and more) as sensor saturation: page 5 with a good illustration.
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Simon J.A. Simpson

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Re: Lightroom 12.3 - Denoise is there
« Reply #83 on: May 23, 2023, 12:51:59 pm »

IMHO, not maybe.
Now one of three (or four) channels may clip while the others do not but clipping is clipping.
It is outlined here: http://www.digitaldog.net/files/Langs_Render_to_Print.pdf but also referred to (and this may be a better term for full clipping and more) as sensor saturation: page 5 with a good illustration.

Agreed.

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