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[OM] Re: About RAW

Subject: [OM] Re: About RAW
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Sat, 30 Apr 2005 07:24:44 -0400
Raw files cannot be edited per se but only converted into another format 
that can be edited.  During the conversion process, however, one can 
modify brightness, contrast, saturation, sharpness and white balance. 
These are the things that can be altered by changing the brightness 
levels of individual color pixels.  Sharpness, for example, is modified 
by emphasizing the contrast between adjacent pixels at "edges" which are 
typified by sudden brightness changes.  The raw file carries with it all 
the settings from the camera at the time it was taken and, if desired, 
can be converted using these parameters as defaults.

Once the raw file has been converted into the in-memory format used by 
the photo editor then other editing operations can begin.  These might 
include further changes to brightness, contrast, etc. but could now also 
include cropping, perespective correction and many other forms of 
editing which could not be directly applied to a raw file.

When the editing is complete the in-memory format must be converted to 
an external file format in order to be saved to disk.  At that point it 
must be converted into JPEG, TIFF, PSD or other photo file format other 
than the raw format.

Chuck Norcutt

Brian Swale wrote:

> Hi all
> A stupid question that should be settled easily - but I don't know the answer 
> or I wouldn't ask it.
> What commonest programs are used for editing E-1 RAW files, (or is it only 
> in-camera?)
> bj
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