[ILUG] RE: [ILUG][OT] JPEG / Graphics Compression

[Breathnach, Proinnsias (Dublin)]

Was picture.ppm a digital graphic, or a photo / still ?
There is a major difference in the compression done on computer generated
artwork, and that on a real-life picture ... take a one of the piccies Liam
posted the other day to the ILAP site, versus a computer generated graphic.

On another note, does anyone else recall a Fractal Image Format ... it could
store 10s of MB of JPG files on a floppy, and could zoom in smoothly on
real-life images up to about 10x ... again with digital images performance
suffered

> -----Original Message-----
> I wrote:
> 
> > ogma$ ls -l gen0.jpg
> > -rw-r--r--    1 colm     users      581874 Sep 28 08:20 gen0.jpg
> > ogma$ for a in $(seq 0 9)
> > do
> >     cjpeg -quality 80 -optimize < picture.ppm > gen$a.jpg
> >     djpeg < gen$a.jpg > picture.ppm
> > done
> 
> Forgot to show that I started with picture.ppm, not gen0.jpg.  gen0
> was there, but only from a previous test.
> 
>