GIF vs JPG: PNG? (was Help about Microsoft PowerPoint

[Peter Murray]

Another good reason is "loss-less compression".  As I understand the
graphics formats, JPEG uses a compression method that declares pixel values
"close enough" and makes them the same for the sake of higher compression
and smaller file sizes.  GIF and PNG use "loss-less compression", where
each pixel value is taken at face value.

Based on this information, you might want to convert your GIFs to PNGs to
maintain transparancy and the lossless compression, and then convert them
to JPEG now to maintain compatibility with existing browsers (which you
might then throw away when PNG is more widely supported).


peter

On Tue, 3 Jun 1997 10:33:31 -0700 grondin.luc at uqam.ca (Luc Grondin) wrote:

> Dan Lester wrote:
>
> >From what I can see, there is NO reason to not
> >convert all your web images to .jpg, since the last several
> >versions of all the browsers support them.
>
> At least one good reason: TRANSPARENCY.  I have not seen or heard that
> you
> could make transparent images in JPEG format.  However, the issues that
> you
> mention over the GIF format are real and it seems that there could be an
> alternative offered by the PNG format: Portable Network Graphics.  I know
> little myself about that format but I did a quick search and found these
> sites:
>
> http://www.wco.com/~png/
> http://www.boutell.com/boutell/png/
>
> PNG is not yet supported by Web browsers (apart for some plugins).  We
> may
> have to stick with GIF for a while.
>
> LucG
>
>
> -------======<<<<<>>>>>======-------
>             Luc Grondin
>      Bibliothecaire/Librarian
>      Bibliotheque des sciences
>   Universite du Quebec a Montreal
> -------======<<<<<>>>>>======-------

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Peter Murray, Library Systems Manager                      pem at po.cwru.edu
Digital Media Services                   http://www.cwru.edu/home/pem.html
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