[argyllcms] Re: Capture One Profiles
- From: edmund ronald <edmundronald@xxxxxxxxx>
- To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 9 Jul 2013 23:55:11 +0200
Let me reformulate my general question into a remark:
If the camera does not change the way it converts the scene to Raw
according to white balance, then the white balance and the "unraw"
operations have little to do with each other; although white balance may be
necessary for final output rendering.
Edmund
On Tue, Jul 9, 2013 at 11:48 PM, Gerhard Fürnkranz <nospam456@xxxxxx> wrote:
>
>
>
>
> Iliah Borg <iliah.i.borg@xxxxxxxxx> schrieb:
> >
> >> 1. Balancing the channel multipliers for better interpolation, i.e.
> >"white balancing" the raw data.
> >> 2. Spacial computations, including interpolation.
> >> 3. Backward application of channel multipliers from the first stage
> >to recover illumination-depended channel values of interpolated image.
> >> 4. Applying the camera profile to interpolated image. At this stage
> >image is "absolute colorimetric".
> >> 5. Correcting the white balance using chromatic adaptation based on
> >mulitpliers from first point or based on human visual evaluation.
> >>
> >> As a result we may get an image with both best interpolation and
> >correct chromatic adaptation. I suppose this approach is performed in
> >modern DSLRs and commercial RAW-converters.
> >
> >No it is not.
> >One can't determine chromatic adaptation other then von Kries
> >transform, and steps 3 and 5 cancel each other.
>
> No, it makes a difference in which space the diagonal scaling is applied.
> Not for the gray axis, but for chromatic colors.
>
> Best regard
> Gerhard
>
>
>
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