Re: DNG As Shot Neutral
Re: DNG As Shot Neutral
- Subject: Re: DNG As Shot Neutral
- From: Jeff Nova via colorsync-users <email@hidden>
- Date: Wed, 9 Nov 2022 15:03:50 -0800
Thank you so much for sharing! I truly appreciate the collegial spirit on
this list. : )
Jeff Nova
Chief Executive Officer
Colorhythm
https://colorhythm.com
Mobile: +1 510-710-9590
Main: +1 415-399-9921
On Tue, Nov 8, 2022 at 2:30 PM WAYNE BRETL <email@hidden> wrote:
> I am absolutely NOT a DNG expert; this is my first reading of the spec
> (dng_spec_1_6_0_0.pdf).
>
> However, a direct reading of page 84 seems to indicate that the linear
> reference space uses unmatrixed sensor pixel values that have been
> linearized and scaled to values between 0 and 1.0. So, it is still the
> camera signal space, but normalized. (I hesitate to call it a color space,
> since it has not been converted to a standard color space yet.)
>
> Then, page 85 continues with the conversion from linear reference space to
> XYZ.
>
> So, as I read it, linear reference space is unique to the camera design,
> and in general is not XYZ, except in the unusual case of the camera pixel
> filters and sensor response being designed to produce XYZ values directly.
>
> > On November 8, 2022 at 2:47 PM Jeff Nova via colorsync-users <co ir G or
> B)email@hidden> wrote:
> >
> >
> > Hey there all,
> >
> > It's me again, poppin up like a meerkat in your inbox. I have another
> DNG
> > question... See if anyone knows...
> >
> > The field *AsShotNeutral* (I sometimes misread this, but I'm sure I'm the
> > only one) is defined as:
> >
> > "...[this field] specifies the selected white balance at time of capture,
> > encoded as the coordinates of a perfectly neutral color in linear
> reference
> > space values."
> >
> > Do they mean XYZ? Or are other spaces permitted? Sounds quite vague to
> my
> > amateur ears.
> >
> > Very best,
> > Jeff
> >
> >
> > Jeff Nova
> > Chief Executive Officer
> >
> > Colorhythm
> > https://colorhythm.com
> > Mobile: +1 510-710-9590
> > Main: +1 415-399-9921
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