Re: 2 degree, 10 degree and observer cmf differences
Re: 2 degree, 10 degree and observer cmf differences
- Subject: Re: 2 degree, 10 degree and observer cmf differences
- From: edmund ronald <email@hidden>
- Date: Tue, 23 Aug 2011 14:27:24 +0200
Tom,
I think that at this point in time and moving forward, we really should
accept that the vast majority of displays are NOT previewing devices for the
print industry or photo labs, but primary viewing devices. It is probably
hopeless to wish to uniformize sense-impressions across displays of
different sizes and brightness. Doubtless, the technology has now moved far
ahead of the century old pioneering psychophysiological experiments which
were originally used as a basis for colorimetry.
Edmund
On Tue, Aug 23, 2011 at 12:31 PM, Thomas Lianza <email@hidden> wrote:
> Hi
>
> I've changed the name of the thread to get it more on target. In my
> discussions with some engineering folk in Japan they mentioned that they
> felt that displays should be assumed to be a "greater than 10 degree event"
> The point is that when two displays are put side by side our impression of
> the white point and natural adaptation is based on the wide field presented
> by the scene. You will find some displays leave the factory using 10 degree
> assumptions of D65 or D50. There is some real merit to this thinking, in my
> opinion. Viewing emissive scenes is quite different than viewing a
> reflective scene because all colors are combined from the three primaries,
> plus a relatively constant level of flare which is dependent upon the
> ambient illumination. This is why small amounts of white point deviation
> have such large effects upon the absolute color. This is why you can have
> really sloppy light booths that "appear" to be neutral and yet a small shift
> in white point on a display is very obvious to a trained observer. With
> respect to the concept of "chromatic adaptation" emissive displays are
> completely different than a reflective environment.
>
> In wide gamut situations, the primaries are necessarily narrow (if there
> are only three). This will tend to increase differences between observers.
> I am working on some papers in this area ; mostly review documents and
> retrospectives to demonstrate how we got to where we are today and some
> discussions of the relevance of sRGB in the brave new world of display
> technology. The benefit of wide gamut displays can be masked by the
> artifacts that narrow band viewing carry. For instance, it is more
> difficult to the display white point with narrow band radiators. In high
> ambient situations, it is nearly impossible to not have a visible cast in a
> narrow band display using standard instrumentation to set white point.
>
> Regards to all,
> Tom
>
>
>
>
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