P3D Re: Scanned Stereo pair manipulation software...

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Mon, 30 Mar 1998
>From: Dylan The Hippy Wabbit writes:
>
>>Dan Shelley wrote:-
>>6 - Save in your output file type of choice. For this example, I would
>>save as an uncompressed JPG.
>
>Oh dear, we've been here before.  I'll try to be brief, even though Dr T
>is away.  ;-)
>
>There is no such animal as an uncompressed JPG.  I know the compression
>setting control often reads 0-99, but it's just an arbitrary number.
>You're not meant to take it literally.  You might mean "Set the
>compression to it's minimum."  If you do you are probably throwing the
>baby out with the bath water.  A moderate compression setting will save
>quite a bit of space (and web server bandwidth) without having any visible
>effect.
>.......................

*****  Just two days ago I was reading some image format comparisons which I
found interesting in this regards. I have started using PNG files most of
the time because they offer license free compression that is NO-LOSS and it
saves *lots* of hard drive space. I went to read more about PNG images on
the internet, and the knowledgeable person who wrote up the page I found
stated that despite the NO-LOSS compression in PNG, some feel they get
better results with photos by using JPG. I might be able to argue with him
especially for issues pertinent to stereo work, but JPG does have it's
advantages at times. 

I never save valuable stereo work in JPG format other than for presentation
across the web. I save first in a NO-LOSS format such as TIF, TGA, and
lately PNG. After saving this *archive* format which is good for any re-edit
needs, I will make a JPG copy for other uses.

As to PNG compression, here is a typical example...  TIFF (1793 KB) vs PNG
(788 KB).

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


------------------------------