According to Ken's statement of some days back
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This is one of those things that is just far enough out of the ordinary
that everybody gets messed up on it initially. Some converters never do
resolve the issue. It took the better part of a year before Adobe
satisfactorily fixed ACR when the E-1 came out. Everything was all honky
dory until Adobe built the DNG converter and promptly broke the whole
thing again and it took a while for them to fix it all over again (and
according to some tests, it still isn't resolved).
-------------------------------------------------------
ACR would have had the problem fixed some time about June 2004 (a year
after the E-1 was announced). But I do find this whole thing somewhat
curious. If the bug is failure to interpret the RGBG pattern for
correct demosaicing how is it that the problem only seems to occur in
very bright highlights and only when converting directly to JPEG.
Sounds like a pretty ordinary bug to me and not something systemic
driven by the Bayer pattern.
Got some more documentation to convince
a skeptical Chuck Norcutt
Candace Lemarr wrote:
> Wow. I had no idea. Obviously.
> So, if I weren't going to use Olympus Master or Master 2 to develop my
> ORFs how would I fix this issue with ACR? Is this something I could
> select in the preferences settings of PSE 8.0 or would it be at the
> "save" point in ACR? I am not seeing any place where I can select which
> algorithm to use.
>
> Candace
>
>
> Ken Norton wrote:
>>> What are the red and blue bits sprinkled about on his shirt?
>>>
>>>
>>>
>> This maize pattern is a well known issue with Olympus RAW files. The reason
>> is actually very easy to understand, and relatively easy to solve. The
>> reason is that Bayer array color ordering of RGBG is different with Olympus
>> RAW files. When interpreted correctly there is no difference than other
>> patterns, but when using a standard ordering pattern you will get a nasty
>> interpretation in the demoisiacing pattern.
>>
>> One primary solution when using DCRAW based converts is to use the VNG-4
>> algorithm. This accounts for the changed pattern and processes ORFs
>> correctly.
>>
>> AG (aMaizing) Schnozz
>>
>
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