DXOMark just tested the D3X

Started Jan 15, 2009 | Discussions thread
sidelight Senior Member • Posts: 1,013
Re: DR is in EV and Tonal Range is in bits (log base 2)

Toermalijn wrote:

sidelight wrote:

Toermalijn wrote:

sidelight wrote:

Zane Paxton wrote:

Bernie Ess wrote:

They say the D3x has 13,7stops of DR,

Hi Bernie,

Their description uses the term "Bits" not "Stops". I couldn't find
any definition on their site that defines or describes what they are
doing as far as units..... There are only 10 zones and maybe 7 of
those are actually useful... 13 stops is absurd... They do use
something called "Tonal Range" which is different from their DR
measurements and is indeed defined in f/stops.

Actually, Dynamic Range is given in EV units which are the same as
stops. Same as Zones in Zone System. The Tonal Range units are bits
on a log scale. Each bit represents a doubling of gray levels. So
10 bits would be 2^10 or 1024 gray levels. I believe that Dynamic
Range is theoretically infinite as brightness can continue to
increase, not that we can see it or record it all. So, DxOMark is
saying the D3X has 13.7 stops normalized to an 8MP 8x12 print (does
this for all cameras using the Print view on the DR Tab). I would
say you are probably right in that it might be hard to see all of
these. But supposedly the info is there.

What it means it has nice graditions of colours...better portrayal of
subtle colours, skin tones etc. The numbers back up what you see in
the examples or prints, fine detail with lovely colours! The more
graditions levels you have, the more subtle colours you could
portrayal.

Toermaljin,

Not sure if you addressed this to me or Zane, but yes I know what
higher bit depth will give. I was clarifying the units used for DR
and Tonal Range and defining them as it did not appear to be clear in
the post I replied to. Finer gradation of tonal values should be
discernible. Not so sure about how much DR will be useable in prints.
--
David

That's why it is probably so confusing, most of the time
printers/also professional print is limited in comparsion to what a
camera can do! a DR of 13.7 in print seems extremely high...It just
tells us that you are able to print fine detail with discernible
colour graditions. e.g., better skin tones etc. In comparison to the
raw file, print will always be limited due to rgb versus cmyk colour
gamut! Pigments used in professional prints close the gap slightly
but nevertheless...You cannot print beyond you colour gamut
limitation, as in print.

Maybe they mean it looks like a DR of 13.7 due to the superb
graditions and tones.

The Tonal Range is what will give the smoother transitions in color and luminance -more bits gives more levels or finer gradations. The DR is just the absolute difference in brightness between recordable black and the lightest white. The tonal range is how finely this DR is divided iinto discrete digitized levels. Yes, prints may have a hard time in showing full DR but tonal range should have impact especially in larger prints. Similar to medium format.

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David

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