Digital BW, The Print

Bob,

Can you send me a file, both before and after, and let me see this for my
self?  That is not what "nearest neighbor" is supposed to do.

I have used pixel replication to upsize video displays (take a 640x480
output and put it on an 800x600 display, where you replicate every nth
pixel/line), and it is simply called "pixel replication".

Austin

> Austin,
>
> Surely not. If I take an image of 10 black and white lines of pixels (to
> keep on-list) and interpolate one new line by Nearest Neighbour
> in PS, it is
> either black or white, not gray. I only get grey lines interpolated (along
> with existing black & white lines being altered to grays) using
> Bilinear or
> Bicubic in PS. That is why I used the words 'duplicate' or 'copy'
> originally
>
> Bob Frost
>
>
> ----- Original Message -----
> From: "Austin Franklin" <darkroom@...>
>
> > Hi Bob,
> >
> > > Surely Nearest Neighbour
> > > interpolation just duplicates pixels (or should I say
> > > quadruplicates?).
> >
> > Nearest neighbor takes the nearest neighbors, adds them up, then divides
> by
> > the number, and basically gives an average.  It certainly isn't
> an optimal
> > interpolation algorithm, and in fact, is the most basic interpolation
> > algorithm I can think of.