[ILUG] RE: [ILUG][OT] JPEG / Graphics Compression
Breathnach, Proinnsias (Dublin)
breatpro at exchange.ie.ml.com
Thu Sep 28 08:52:09 IST 2000
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
> -----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.
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