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From: Bobbie Giordano
Date: Tue, 1 Oct 1996 17:14:57 -0400 (EDT)
Subject: Re: Max Opt Res - common language.

Having just signed on PhotoForum recently, I have sat back and been
fascinated by lively discussions of topics I've not heard discussed
before. Bravo, all! I only hope I can hang around, being on two well-
trafficked mailing lists at once can be grueling, however enlightening.

I'm trying hard to follow this one conversation relating to photo image
interpolation and its corollary, the matter of resolution in digital
printing and scanning. I really seek just two, maybe obvious, answers:

(1) Could someone define, as to their differences, the terms "bicubic"
and "fractal" algorithms used in interpolating images?

(2) I figure I must be missing something of common knowledge and/or
interpretation here, but in reading the examples bandied back and forth
by Tracy Graves and Dr. William Jacobus given below, I am most confused,
that is certain. In one example, 3,000 X 3,000 = 9,000,000, exactly as
my calculations would show, and in the other example, 600 X 600 = 3600.
The first example would indicate dpi to me, but I thought 600 X 600 equals
360,000 [3600 is equal to 600 X 6 or 60 X 60, right?] I know we're also
discussing linear vs. square inch measurements, but this still doesn't
make sense to me. What am I missing here?

Thanks ahead.

Bobbie ,=-/[]\--,
| -/~~\ |
>>>>>>>>>>>>> A PICTURE'S WORTH A THOUSAND WORDS <<<<<<<<<<<<< |__\__/__|
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

On Tue, 1 Oct 1996, Tracy Graves wrote:

> On 30 Sep 96, Dr. William Jacobus interjected about Re: Max Opt Res -
> common language.:
>
> > Tracy-
> >
> > You said-
> >
> > > Now let's check and see if we're talkin the same lingo heeyar.....
> > > that is "supposed" to be 600 X 600 dpi on the printer..... doesn't
> > > that suggest that at 600 X 600 = 3600 mean that my printer can
> > > output 600 dpi greater than your 3000 dpi scan???
> > >
> > Your calculation allowed you to go to 2 dimensions, while you
> > restricted me to only one. Not fair.
> >
> > 600 X 600 = 3,600 per 1 sq inch
> >
> > 3,000 X 3,000 = 9,000,000 per 1 sq inch
> >
> > I win by 8,996,400 dots!!! per square inch
>
>
> Cheater! You must be taking data liberties! P^)
>
> You said: 3,000 D P I ..... is that or is it not DOTS PER square
> INCH????? By your explanation, that is 3000 DOTS PER linear INCH.
>
> I believe that the printer reference was 600 x 600 per inch.