Digital BW, The Print

Pics4U@... wrote:

>
> > I do not understand how one can separate 'color' information and
> > 'detail'?
> >  They are one and the same.
>
> The difference is in the chrominance and luminance. You get
> far greater critical information from the luminance
> channel than from the chrominance channels. That's the
> reason they use 2 green receptors for every red and
> blue.  You can have a sharp picture with good luminance
> detail but look crappy from color smearing in the chroma
> channels.
>
> it's also another good reason for only apply the unsharp
> mask to the luminance channel.
>
> Greg

But the luminance is only captured for the specific color of the specific
sensor.  Which is only 1/3 of the information needed to be real.  For example,
the red sensor can only capture the 'luminance' of the red information, the rest

of the luminance information, once again, is interpolated and therefore made up.

Harvey Ferdschneider
partner, SKID Photography, NYC


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