Digital BW, The Print

At 11:36 AM 4/10/03 -0400, you wrote:


>Alan Zinn wrote:
>
> >Regarding metamerism,   virtually all colorants - paints, inks, dies - look
> >different under different light.   A water color painting (which contains
> >both pigment and dye) or litho print won't look exactly the same under
> >every light source.   It would seem that full color ink jet images would be
> >no different than with other media. It is only with attempts to create
> >monochrome from CMYK inks that it becomes a problem. Or is it a
> >problem?  Do we see ANY picture outside a gallery in it's ideal light? I
> >don't see how  that ever can be corrected given all the paper, ink, dye
> >variables. It seems to me that a more workable solution, with regard to
> >gallery display at least, would be to correct for two types of light
> >sources like film.  There could be a warm light or cool light set of inks
> >or adjustments.
> >
> >
> >
> >
>Metamerism is NOT simply looking different under different lighting or a
>predictable color cast brought on by differing source lighting.. That's
>a given optical phenomenon...
>
>Metamerism is the tendency of different colorants to respond differently
>under different lighting conditions, leading to optical color crossovers
>and inconsistent color casts under differential lighting..
>
>Let's get what we are talking about clear first, before we posit
>solutions...
>Keith
>
>  Keith,

Keith,

Please elucidate then sir.  What do you mean "respond" and  "optical color 
crossovers" ?  The way you put it,  it seems that in the final analysis the 
effect is the same.  How for example do watercolor inks and dyes differ 
from ink jet colorants with regard to color shifts?  Is it due to  the way 
the materials are laid down on the surface i.e. little dots?   Are you 
saying that each image will exhibit a different degree of objectionable 
shift with the same inks depending on the density of the tones?

AZ



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