> Sender: [EMAIL PROTECTED]
> From: "James H. Cloos Jr." <[EMAIL PROTECTED]>
> Date: 07 Mar 2002 06:58:50 -0500
> To: [EMAIL PROTECTED]
> Subject: Re: [Fonts]Standard Type Service Framework (STSF): Public Review
> -----
> >>>>> "Juliusz" == Juliusz Chroboczek <[EMAIL PROTECTED]> writes:
>
> JC> The result is that PK's compression is subliniear on this face at
> JC> mag factors less than 14 and superlinear above mag factor 14.
>
> Juliusz> PK does run-length encoding, right?
>
> That is what I recall.
>
> Juliusz> Then it should be linear as the point-size goes towards
> Juliusz> infinity (i.e. after the effects of MF's optical scaling are
> Juliusz> no longer visible). If not, there's something weird going on.
>
> OK. I just figured out the (rather inane) error. I was comparing the
> file sizes to the mag factor, not to the square of the mag factor.
>
> [SIGH] :(
>
> Taking that into account, even the the GF files show sublinear byte
> size expansion when linearly scaled (same pt size, higher dpi).
>
Not at all weird: there is two dimensional similarity to exploit in the
data. So while you start off with the data going as N^2 the resolution,
you not only get multiple instances of each pixel on each line, but many
identical lines. So you expect sublinear scaling. I suppose I could
as a serious mathemetician what function to expect, but this data may
be good enough.
And once you pass the point where subpixel decimation and anti-aliasing
are neededed, you have essentially only one color for every pixel.
Thanks for gathering some preliminary data: we need to figure out how
to plot it...
- Jim
- Jim
--
Jim Gettys
Cambridge Research Laboratory
Compaq Computer Corporation
[EMAIL PROTECTED]
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