Chroma is not necessary happen on the edges, here is the test for Zuiko
180/2.8 with film not digital.
http://www.accura.com.hk/OM/180TEST.htm
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Wednesday, February 04, 2004 11:25 PM
Subject: [OM] Re: can your digital do this?
> I tried repairing your image in PW Pro using the chromatic abberation
> tool. It has no effect except to worsen the image toward the edges of
> the field since it assumes that chroma is zero at the center (as it
> should be) and gets worse the further you move off axis (as do almost
> all optical abberations)
>
> I then tried to repair it using the scanner registration tool. The
> scanner registration tool is for fixing scanner related problems where
> the registration of the red green and blue channels are slightly off
> from each other. However, that had no effect either other than to
> worsen the image. I expected that since I think a registration error
> would cross the entire image but I decide to try it anyhow.
>
> I still don't understand what's going on here.
>
> Chuck Norcutt
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