Thread: Stock camera better than FCamera?
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handaxe is offline handaxe
2014-04-23 , 00:41
Posts: 1,378 | Thanked: 1,604 times | Joined on Jun 2010 @ Göteborg, Sweden
#39
Originally Posted by geohsia View Post
From the research I've seen there is something about the oblique angle of light against the sensor that causes the color cast in the RAW files.

I've used a program called CornerFix to address the issue:
I have used CornerFix and indeed it does the job. However, I found it frustrating as I wanted to extract the correction parameters and there was no way to do this. So I explored alternatives and stumbled across one that is integrated in the workflow of developing .dng images.

The most recent version of Rawtherapee has a Flat-field correction option that gets applied at the start of the chain and works just as well as CornerFix. Same principle.

The tricky issue with n900 raws is that they manifest two distinct types of vignetting: the most common dark periphery kind, as well as colour-casting. Corrections for the first kind can be fudged in gimp etc with radial filters but the second is far trickier...

This is a link to another piece of free (mostly OSS but there appears to be 1 binary(?)) software to deal with the issue. Good explanations. Software needs compiling and principally is for Gnu/Linux.
Last edited by handaxe; 2014-04-23 at 00:54.
 

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