Ken
That is disturbing information. I had trusted that DNG were
"untouched" files to all intents and purposes.
However, lately I have been using LightRoom to adjust images and then
to export them to jpgs, so I don't think that it will have affected
me recently. But up until a few months ago I was converting
everything to DNG ...
Chris
On 1 Nov 2006, at 19:09, AG Schnozz wrote:
> I downloaded the latest/greatest DNG converter from the Ad*be
> website and did some testing. Previous attempts at DNG
> conversions on the E-1 files were less than successful, but I
> figured that I'd give it another go.
>
> I converted about 15 images and noted that the file size with
> lossless compression dropped to about 1/2. Ok, good so far.
>
> Then I opened up the files in the lastest ACR and compared them
> to the original ORFs. Something was just a little off, but
> wasn't quite sure what. There was something different in the
> highlights.
>
> Next I opened up the DNGs in RSE 2006, which supports DNG file
> formats. Uh oh. Lot's of pattern noise. No, we're not talking
> subtle noise either, but in-your-face patterns resembling a
> maze. Completely unusable noise.
>
> I reconverted the files into DNG not using the compression and
> tried again. This time the noise changed, but was still
> present.
>
> What it looks like to me is that during the conversion to DNG,
> the bayer-matrix was shifted down and over by a pixel cell and
> the RG and BG placement was mis-mapped into adjacent cells.
>
> The ACR conversion appears to be supressing the pattern noise,
> but the luminous information isn't lined up with the color
> information. I did not get an opportunity to test Lightroom on
> the files, but suspect that it uses the same ACR engine.
>
> At this point, I think I'll continue to stick with the original
> RAW files and not try to convert them to DNG. This is probably
> best because it allows me to still use Olympus Viewer for the
> odd picture where I want to utilize Olympus' color mapping.
>
> AG
>
>
>
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