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Re: [OM] Spotmeters

Subject: Re: [OM] Spotmeters
From: "Piers Hemy" <piers@xxxxxxxx>
Date: Thu, 26 Feb 2015 14:33:49 -0000
Chris, you are mistaken in believing that TIF output from E-500 (or any
other camera) is a raw file. It cannot be so, either for Olympus or any
other camera (except perhaps a Sigma with Foveon sensor, of which I have no
experience) because any raw file is not a complete RGB image. Remember, each
pixel has only R, G or B data depending on the Bayer filter array, and the
complete RGB image has to be derived from the raw data. 

If you are looking at a TIF file it must be a derivative from  the raw data,
and therefore must have had some processing applied. 

I believe that  "some processing applied" explains why you believe there are
"opportunities for the camera to exercise its "opinions"."

Piers

-----Original Message-----
From: olympus
[mailto:olympus-bounces+piers.hemy=gmail.com@xxxxxxxxxxxxxxxxx] On Behalf Of
Chris Trask
Sent: 26 February 2015 13:56
To: Olympus Camera Discussion; Olympus Camera Discussion
Subject: Re: [OM] Spotmeters

>
>UV filters only let in UV light. 
>

     Um...  no.  UV filters block UV light, which is often associated with
haze.

     Other than that, you're right on the mark.  But, as we found last year,
the Wratten filters used with B&W film do not work the same way with
digital.  Nor do the internal colour emulations in the E-500/510/520, and
according to a local B&W expert that's the nature of the beast.  Can you say
"disappointing"?

     Because of this I've resorted to taking the best colour photo I can,
correcting for the ambient light tempereature with 81 and 82 series filters,
then digitally adding the Wratten filters with FilterSim, and finally
converting to B&W with DxO FilmPack.

     However, looking at the manuals for the E-500 and E-510 yesterday
revealed that at least with the E-500 there are no modifications made to the
image in RAW mode, you're instead recording the actual pixel data.  Since
the E-500 has a 24M TIFF raw recording mode I'll make an initial comparison
between that and the 1.7M JPEG mode to see if this is true, then make the
same comparison between those and the ORF raw mode if there's a noticeable
difference.


Chris

When the going gets weird, the weird turn pro 
     - Hunter S. Thompson
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