If you overexpose too far, you can loose one or two channels. That applies to every digital. Most times, only green channel is left. Which kinda doesnt go with that magneta filter thing, but I never tried that (and I will eventually ) so cant judge.
Otherwise if you expose "normal" way, then you have most information in place which is most exposed and not overexposed. From there information goes down (degrade) until they reach noise in shadows.
In theory if you overexpose a lot (in case of A900 +2 eV is pretty much ok) then it might happen that when you pull back, somewhere in deeper shadows colors will get out of control. But most likely only if you lift shadows.
Thats pretty much theory, as in practice its not likely to happen. If it would, its cause A900 has 12 bit ADC. 14 bit should prevent this. But thats just another theory as most cameras with 14 bit max out highlights much sooner than A900 and noise floor tends to be unfriendly much sooner than you hit 14 bit limit.
I think only thing you risk in real life when doing ETTR with A900 is that you will overshot and blow one or two channels.
Mescalamba wrote:
If you overexpose too far, you can loose one or two channels. That applies to every digital. Most times, only green channel is left. Which kinda doesnt go with that magneta filter thing, but I never tried that (and I will eventually ) so cant judge.
Otherwise if you expose "normal" way, then you have most information in place which is most exposed and not overexposed. From there information goes down (degrade) until they reach noise in shadows.
In theory if you overexpose a lot (in case of A900 +2 eV is pretty much ok) then it might happen that when you pull back, somewhere in deeper shadows colors will get out of control. But most likely only if you lift shadows.
Thats pretty much theory, as in practice its not likely to happen. If it would, its cause A900 has 12 bit ADC. 14 bit should prevent this. But thats just another theory as most cameras with 14 bit max out highlights much sooner than A900 and noise floor tends to be unfriendly much sooner than you hit 14 bit limit.
I think only thing you risk in real life when doing ETTR with A900 is that you will overshot and blow one or two channels. ...Show more →
That's not what the conversation was about, though. Iliah Borg and Andrey Tverdokhleb were talking about exposing the midtones a couple of stops over where the camera meters middle grey. For instance, if you have a scene with a very small dynamic range, rather than pushing the histogram far right, they recommend still exposing around the midtone, if good color is the goal. Either way, there are other threads about it.
Douglas; that makes sense to me and rhymes with my experience so far with digital. Proper exposure usually pays off even in dull light. Pushing the histo is a necessity born out of a dynamically challenged compromise.
douglasf13 wrote:
That's not what the conversation was about, though. Iliah Borg and Andrey Tverdokhleb were talking about exposing the midtones a couple of stops over where the camera meters middle grey. For instance, if you have a scene with a very small dynamic range, rather than pushing the histogram far right, they recommend still exposing around the midtone, if good color is the goal. Either way, there are other threads about it.
Sounds interesting, you don't happen to have a link?
I suspect that this has to do with the nonlinearity of the color response and the simplifications made during color reconstruction at the debayering stage...
KaaX wrote:
Sounds interesting, you don't happen to have a link?
I suspect that this has to do with the nonlinearity of the color response and the simplifications made during color reconstruction at the debayering stage...
Unfortunately, I don't have the links anymore, as it was a few years ago. Iliah publishes his email publicly on various forums for questions, so you could ask him directly: [email protected]
douglasf13 wrote:
Unfortunately, I don't have the links anymore, as it was a few years ago. Iliah publishes his email publicly on various forums for questions, so you could ask him directly: [email protected]
) so cant judge.