Re: Exposure Value
Re: Exposure Value
- Subject: Re: Exposure Value
- From: Iliah Borg via colorsync-users <email@hidden>
- Date: Fri, 21 Jun 2019 18:32:37 -0400
Dear Roger,
Based on your gray card NEF:
You are in 14-bit mode, maximum is 2^14-1-black level (600) = 15873; average on
the card (and the card seems to have some rather strong imperfections) is 1181
(you can check with RawDigger, trial version is enough). That puts the exposure
at log2(1181 / 15871) = 3.75 EV below clipping; the camera is calibrated to
produce midtone 3.35 EV below clipping, that means the exposure is 0.4 EV below
the midtone.
Nothing dramatic so far, provided that the card has a lot of wear and tear on
it, it isn't shot out of focus, and not at an angle as it should be (see
http://www.zonephoto.it/images/pdf/kodak-grey-card1903061.pdf ). The result is
mathematically inconclusive - but from my experience I would be expecting
something like the numbers above, given how the shot was taken, and would say
that metering is calibrated OK.
Of course, if you could re-shoot we will be able to come to a more definite
conclusion.
On Jun 21, 2019, at 6:03 PM, Roger Breton via colorsync-users wrote:
> I will get to the Gray Card NEF in a few minutes, Ilah, but I thought I would
> try turning on Image quality = NEF + JPEG in the camera shooting menu?
>
> And I got very different results?
> See this link:
> https://1drv.ms/u/s!AkD78CVR1NBqkLVK68wxOJ6dhvv2nQ
>
> On the left hand side is the JPEG opened in Photoshop as usual, and on the
> right hand side is the RAW, opened in CameraRAW. The only thing that I could
> say is the Histograms are very different, this time, extending well into the
> highlights...
>
> Thanks for you guys patience and help.
> I'm trying to contact Nikon tech support...
>
> Best / Roger
>
>
> -----Original Message-----
> From: colorsync-users
> <colorsync-users-bounces+graxx=email@hidden> On Behalf Of
> Roger Breton via colorsync-users
> Sent: Friday, June 21, 2019 5:44 PM
> To: 'Wayne Bretl' <email@hidden>; email@hidden
> Subject: RE: Exposure Value
>
> I just tried with ViewNX2 and it is still too "dark"?
> So it is not coming from CameraRAW -- good news 😊
>
> ViewNX2 link is here:
> https://1drv.ms/u/s!AkD78CVR1NBqkLVIL-cOCJBYIX0LuA
>
> CameraRAW link is here:
> https://1drv.ms/u/s!AkD78CVR1NBqkLVJgBzv-yK7ygFD7g
>
> The histograms are not lying, this is under-exposed.
>
> Best / Roger
>
>
>
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--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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