Re: Exposure Value
Re: Exposure Value
- Subject: Re: Exposure Value
- From: Iliah Borg via colorsync-users <email@hidden>
- Date: Fri, 21 Jun 2019 17:43:18 -0400
Dear Roger,
Disagreement within half a stop given you are outdoors, light may be changing a
little and you are not using spot-meter in the camera doesn't look bad.
If you think images come darker than they should in ACR and feel like baseline
exposure parameter in ACR may be miscalibrated, shoot raw + JPEG and compare
the lightness in ACR to the lightness of the JPEG in some colour-savvy viewer.
If the lightness is approximately the same, nothing to worry about, except
familiarizing yourself with what is baseline exposure parameter (DNG specs pdf
contain a description) and why it should be turned off ;)
"Darker" doesn't mean underexposed, it can be anything, including
"under-developed". Underexposed is when important objects, including those in
the shadows, are too noisy.
On Jun 21, 2019, at 4:55 PM, Roger Breton via colorsync-users wrote:
> I know this may not sound very much like color management but I have to ask 😊
>
>
>
> Here is a link to an Excel sheet where I compare the Exposure Value from my
> camera to the Exposure values calculated from a scene original photometric
> properties.
>
>
>
> https://1drv.ms/x/s!AkD78CVR1NBqkLVHRATQaJhc56YZww
>
>
>
> I suspect my camera “light meter” is kaput?
>
> But after going through the calculations, I’m not drawn to the same
> conclusion.
>
>
>
> If you have a chance and are familiar with Exposure Value determination, I
> would appreciate you give me some feedback on my equations.
>
>
>
> I think I’m on the right track but, since I never went through these
> equations before, I have a doubt.
>
>
>
> Best / Roger Breton
>
> www.graxx.ca
--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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