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Re: [OM] Spotmeters

Subject: Re: [OM] Spotmeters
From: "Piers Hemy" <piers@xxxxxxxx>
Date: Thu, 26 Feb 2015 16:26:49 -0000
You may think your assumption is safe, Chris, but if so, it is also most
certainly a mistaken assumption. You are deluding yourself, I regret.

Piers

-----Original Message-----
From: olympus
[mailto:olympus-bounces+piers.hemy=gmail.com@xxxxxxxxxxxxxxxxx] On Behalf Of
Chris Trask
Sent: 26 February 2015 16:05
To: Olympus Camera Discussion; Olympus Camera Discussion
Subject: Re: [OM] Spotmeters

>
>>      Which is why I'm going to do the comparison as post-processing TIF 
>>files can be done with any graphics software, whereas ORF (Olympus RAW 
>>Format) cannot.  The remark about RAW files being unprocessed is right in 
>>the E-500 manual on page 180, E-510 manual on pages 45 and 109, and in 
>>the E-520 manual on page 135. 
>
>Yes, ORF is an Olympus Raw Format file but TIF is not a raw file
>format, it is a graphics file that has been processed from the raw
>output of the sensor, where as the ORF file (is in a generalised
>manner), a screen capture of the actual sensor output with no
>processing applied.
>

     I'm going to again disagree here.  In the E-500, an ORF file is 13.6M,
whereas a TIFF file is 24M.  Since the sensor itself has approximately 8MP
and 3 bytes/pixel (or 1 byte/colour/pixel or 24 bits/pixel), the dead-nuts
raw data from the sensor is  approximately 24M, the same size as the TIFF
file.  That being the case, I'm making a safe assumption that the TIFF
format is the ultimate RAW format (no compression and hopefully no
processing), whereas the ORF file is slightly compressed (but no
processing).

     I revisited my B&W experiments from last year and looked at the few ORF
files I had saved.  I exported one as 16-bit TIFF (resulting in a 58M file)
and viewed it in Corel PhotoPaint and DxO FilmPack.  The resolution was nice
and crisp, but I would like to be able to bypass the ORF-to-TIFF conversion
and record the same image as TIFF.

     This may seem like a lot of work, but I am determined to find some way
of overcoming the problems associated with taking digital B&W photos with
glass Wratten filters.  Yes, I can presently do so by taking the best
possible colour photo and then post-processing with FilterSim and DxO
Filmpack, but I would really like to return to the hard-won expertise of
taking good filtered N&W photos in the field.


Chris

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