RE: filmscanners: film vs. digital cameras - wedding/commercial photography

[Robert Meier]

--- Austin Franklin <[EMAIL PROTECTED]> wrote:
> > Third, the 6 megapixel resolution is an interpolated resolution.
> 
> That is not true.  The luminance information in one shot digital
> cameras is
> NOT interpolated (except in the Fuji cameras), only the chrominance. 
> Color
> information is not near as critical as edge information.  You still
> get full
> 6M pixels of edge information.

Most digital cameras use an GRGB patter. Further, the luminance is
defined as approx. Y=0.3R + 0.6G + 0.1B. Since you do not have all
color information you first have to interpolate it to calculate the
luminance value. Therefore, the luminance value is also interpolated.
By the way, the formula also shows that the green channel is most
important for the luminance. That is why there are usualy twice as many
green values then red and blue values. That give you the advantage that
the luminance channel will be more accurate then the chrominance
channel. But it STILL has to be INTERPOLATED.

Robert


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