6D Dynamic Range

Started 3 months ago | Discussion thread
rhlpetrus
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Not true (flat rendering) Re: Wrong and example of 14EV image
In reply to brightcolours, 3 months ago

brightcolours wrote:

Mako2011 wrote:

brightcolours wrote:

Slideshow Bob wrote:

brightcolours wrote:

Slideshow Bob wrote:

Here you go...



... that's 14 stops right there. It's not a good photo (just the view from my office), but it COULD have been, given a better subject and similar lighting conditions. Explain to me how an 11 stop camera would have done it better.

Why do you say that is 14 stops? That is less that 9 stops. And yet still it looks drab and contrastless, how come there are no blacks, just a bunch or muddy dark tones all bunched up together? It is a badly chosen scene that will look crappy with any camera anyhow. And low sun sets are NOT a DR challenge at all.

Anyhow... Lifting shadows is something odd, only on forums you see talk about it and only by spec sheet lovers... Real photographers care about the light, and about contrast, and about shadows. The DR hype is... indeed mostly a hype.

Well Brightcolors, when the sun blows out in two channels, and the blacks clip in the darkest part of the image, that's called using all the dynamic range of your camera. And when your camera has 14 stops of DR, any image that behaves as such does indeed have 14 stops of DR. So you're only 5 stops short (quite a lot for a REAL photographer who cares about the light, and about contrast, and about shadow!!!), but thanks for playing!

So do tell what you did in post processing to make sure 14 stops of DR was in that image. Too funny...

By definition...the RAW data was taken with a sensor rated at 14 stops. If the data was clipped at both ends...then the scene contained 14 stops or greater of DR . If you look at the pic and compare the details in it to those of the RAW file...and you can see the details at the two ends...then you have it. If you take the capture with a camera having only 12 stops of DR, then the resulting detail at the two ends will be lacking in comparison. Whether that is important or not for the image is a mater for the artist. Printed really big and placed on a wall..it might actually be very noticeable. Some scenes will show a difference in print more readily than others.

That is not true. It does not matter how much DR the RAW is able to hold. The tonal curve used is what matters. Normal tonal curves in RAW converters use under 10 stops. The rest gets trashed. The image we see is NOT from a 14 stops scene (we know this, as it is a low sunset image). The histogram of the RAW data will NOT show a range of 14 stops DR.

How do you know, have you checked the RAW histogram and values? This could well have a 14EV range, why not? You are right that JPEG curves tend to end both below and above short of the RAW data. With some recovery tools and good PP, one can recover the full 14EV if they are there.

We just see an image from a guy with a Nikon. And I asked how he got the 14 stops of DR in that one image then, what he did in PP. Because if you just convert any image, the RAW converter does not give you a 14 stops DR image (14 stops images are awfully contrastless stuff).


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That's not true necessarily, since what gives the sense of contrast is the slope of the -2 to +2 EV range around midtones, not the very low or very high part of histogram. A well-done recovery will just lift some shadow detail and bring back the jpeg-clipped HLs, with soft roll-off ends. My tests with RAW histogram shows that in-camera jpegs tend to cut very early in both ends, whatever camera you use. In camera correction tend to be not that good, PP is needed to use all DR present in RAW. Be it 12 or 14EV. But it's there.

This is a 14+EV image, not too dissimilar from the one posted (no PP, a little touch of shadow recovery would makes it pretty decent):

http://forums.dpreview.com/forums/post/50779738?image=0

It was shot with the D5200, which also has about 14EV of DR. It looks pretty nice actually. There area many 0 values in RAW and Sun is mostly clipped, all channels.

Renato. http://www.flickr.com/photos/rhlpedrosa/ OnExposure member http://www.onexposure.net/ Good shooting and good luck (after Ed Murrow)

Edited 3 months ago by rhlpetrus
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