Interesting new Ricoh GRIII metering - expose to the right finally?

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OP Raist3d Forum Pro • Posts: 38,605
Re: Interesting new Ricoh GRIII metering - expose to the right finally?

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

SirPeepsalot wrote:

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

Raist3d wrote:

SirPeepsalot wrote:

teemodk wrote:

SirPeepsalot wrote:

teemodk wrote:


Coincidentally - a clean black wall shot with full ETTR should also come out white, so an in-camera ETTR implementation should probably include a safeguard on the maximum amount of stops to overexpose when possible.

Only if you want to use the jpeg directly from the camera. If you want the least amount of noise in the raw image, you want to give it as much light as possible.

At some point the marginal benefit becomes negligible and if you ETTR a uniform dark surface your image will be dominated by haze and a heightened black point all while requiring multiple additional stops of shutter speed.

Might be true, I have never felt the need to photograph black walls
Anyway, it's always the user that is to blame for the outcome, never the camera. Learning to use the equipment is more important than features. But if the new exposure mode actually works it would indeed be very helpful.

There is almost no chance that the GRIII does meaningful ETTR

Well... have you tried it? It’s a new metering mode

Don't have one to try, is there a manual online ? How is it described in there ?

yes and yes It certainly would be good to try a real one to see how well it works My comment comes precisely because I looked at the manual/ but I agree needs to be tested in the real world

Here's the manual:

Page 65 lists the traditional Multi, Center-weighted and Spot modes, what were you refering to ?

nm this is the GRD-III (facepalm ricoh)

So this is the GRIII manual:

And it lists a "highlight-weighted" mode that "Meters exposure in multiple areas of the frame with emphasis on the bright areas."

So yeah sounds like "make sure the highlights are retained even at the cost of underexposure" mode which is only tangentially related to ETTR.

Afaik this is ettr The way Reichman described it a while back/ years ago at least

No, at least it's not the salient part of ETTR - in ETTR the protection of the highlights comes into play only after you apply positive exposure compensation in a scene that would have otherwise left them in tact based on your prefered metering choice, if you need to worry about highlights in the beginning then you are exposing to the LEFT.

Again, this doesn't make sense to me- at least the way it was defined by Reichman. The reason it's called expose to the right is not because of how EV compensation is used, but how the histogram looks (ie. you try to capture the highlights, thus the histogram has data in the high bits). The attempt here is to maximize data capture.

The highlights will always be at the right of the histogram - that's what makes them the highlights !

No, this is missing the point. You want to make the highlights go to the very edge of the right in the histogram, preserving them. It is this key difference what makes ETTR's definition. You can always have highlights all he way *through* the right (clipping) or just "towards the right side" but without touching or close to touching the right side (under exposure).

That is just a regular exposure strategy to make use of the entire sensor dynamic range while prioritizing highlight detail over shadow detail. It is just as applicable to film (slide more than negative) as it is to digital.

Well, of course! That's the point! But it's what the term ETTR is associated and defined as.

ETTR is an exposure strategy specific to digital because it takes advantage of how digital information is captured and quantized as more tones can be distinguished in the shadows by exposing them as midtones and in midtones by exposing them as highlights.

As long as the highlights don't clip.

The difference is how closed to midtones and the shadows are to them, so yes applying positive exposure compensation relative to the perceptually expected final result is what ETTR is all about.

This is not what is clearly defined in the link provided. And from that link also note that it does mention Michael Reichman's talk on it.

Sorry but I can't agree with your claims of the definition of what ETTR is.

Well I can't force you to but if you take a moment to think about the purpose it serves and its uniqueness to digital capture you'll see that it is the only the thing that makes it a 'thing' to begin with.

I am not saying that what you think of exposure isn't a valid one. My claim is that this is how ETTR's been defined in digital image capture. I gave you the link, the references. I can't do much more than that.

Really it shouldn't be difficult to distinguish between things that are diametrically opposite - if you were to work in full manual mode highlight protection strategy would produce a picture either as intended to be viewed or one that needs shadows to be pushed in post whereas ETTR would produce a picture that needs to be pulled (or curve-adjusted downards) in post.

Well of course a shot in ETTR has to be adjusted (actually curve adjusted up, not down).

Down, as the captured raw values would be higher than perceptually intended.

Again, depends on the scene. In a high contrast scene where you expose for highlights, you need to bring it back up.

The point is to maximize image capture. I gave you the link that defines it. I am not saying you may agree with the idea of shooting like this, but this is what it is defined as. Hell, I don't shoot like this most of the time either.

I just found curious that the Ricoh GRiii has finally what seems to be a metering mode that seems to support this ETTR thinking as one of the few first cameras that do.

That's because it didn't and you are confusing highlight protection with ETTR.

I don't believe I am confusing anything. I gave you the links, and even the original discussion of the term on that.  I welcome skepticism, which is why I gave you the links so you can read it by yourself.  I am afraid we definitively don't agree here.

Btw many cameras have 1-stop ETTR mode builtin, it is known as low-expanded ISO or 1 stop bellow "native" ISO.

It's not because they still don't exposure to the right per se. They can still clip. What that does is moves the DR window to get more highlights.  Yes, I know about it, as I did my own experiments back then with the 4/3rds Olympus e-620/E-30.  Some cameras do it as a default, others allow you to set it (Pentax highlight priority).  For Fuji the DR 200%, 400%.  But that's not ETTR.

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Raist3d/Ricardo (Photographer, software dev.)- I photograph black cats in coal mines at night...
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