Half-toning is a specific kind of dithering, namely cluster-dot ordered
dithering. Another kind of dithering is a random dither, or stochastic
dithering. So the general term is dithering, not half-toning. You can read
about this in sec. 13.1.2 in Foley and van Dam's classic book, "Computer
Graphics" Second Edition. I guess it doesn't matter what Adobe says about
it. These are old terms that have been around a lot longer than Photoshop.
Frank Paris
marshalt@spiritone.com
> -----Original Message-----
> From: owner-filmscanners@halftone.co.uk
> [mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Austin Franklin
> Sent: Tuesday, February 27, 2001 7:18 PM
> To: filmscanners@halftone.co.uk
> Subject: RE: filmscanners: File sizes, file formats, etc. for printing
> 8.5 x 11and 13 x 17...
>
>
> > Austin writes ...
> >
> > > Now, another question...why do you call it 'dither' instead of
> > halftone?
> > > ...
> >
> > I consider "dither" as the general term, which includes
> > "halftone". "Halftone" would seem best applied to traditional
> > methods, and not include some of the newer techniques ... e.g.,
> > "random" or "stoichastic" dithering ... but that may be just me :o)
> >
>
> Well, I asked because someone wanted to 'discuss' with me that halftone is
> not the proper term, that dither was. I've been in digital
> imaging for over
> 20 years, and I believe halftone is still appropriate to call the overall
> process...and dither is but one method employed in halftoning...so I think
> you have it reversed...and apparently Adobe agrees with me if you check
> their technical articles on PhotoShop on halftoning...so I was curious why
> you, also, called it that instead of halftoning. Not saying you're wrong,
> but my understanding is different. Check the Adobe site and let me know
> what you thing... If you want the URLs, I can dig them up.
>
> Regards,
>
> Austin
>
>
