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Re: Any Minolta/Sony users ...

PeterN
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SubjectRe: Any Minolta/Sony users using UFRaw and GIMP?
FromPeterN
Date04/21/2014 01:20 (04/20/2014 19:20)
Message-ID<lj1koo01cq5@news1.newsguy.com>
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Newsgroupsrec.photo.digital
FollowsAlan Browne
On 4/20/2014 5:22 PM, Alan Browne wrote:

Alan Browne
On 2014.04.20, 16:49 , PeterN wrote:

PeterN
The only time you might see a difference would be if there were colors in the LAB spectrum that are not in the RGB spectrum, and those differences would rarely be noticable in a photograph.

Alan Browne
A good point - but nospam's contention is conversion differences.

Let's color the situation. The files were taken from raw, reduced in size, saved as TIFF in each RGB and Lab. Re-loaded and compared (differenced). There is not a hint of delta.

http://tinyurl.com/m35p59t RGB

http://tinyurl.com/mldetvx Lab

http://tinyurl.com/mvl6vwj Diff

Saved as a tiff in LAB applied curves in LAB mode to try for dark shades that are not in the RGB spectrum and back to RGB.

<https://dl.dropboxusercontent.com/u/97242118/lab%20test.tif>

converted the above to RGB, to LAB & back to RGB, and back to LAB <https://dl.dropboxusercontent.com/u/97242118/lab%20test%20rgb.tif>

Anyone can do their own subtractions.

-- PeterN