On Mon, 1 Feb 1999 [EMAIL PROTECTED] wrote:
> But you won't have the original image. An especially in images with sharp
> edges (which occur often in MSX pictures!) you will lose _lots_ of detail
> even if you use 90% quality -- it's simply a consequence of the compression
> method used. Just try it: make a simple image, preferably on your MSX :-):
> a purple square on a yellow background. Save it as bitmap, and convert it to
> a JPG. There is NO way you will retain the sharp edges in the JPG...
Exactly. JPEG was designed specially for compressing of real images (i.e.,
photos or digitally acquired images), and is based in the fact that usual
images don't have abrupt transitions of color and human's eyes have less
optical resolution in chrominance than luminance.
GIF was designed as a simple method of compression based only in
statistical factors, that is excellent for drawings and synthesized
images, like games, and is based in the fact that drawings have too much
equal colors (i.e., drawings have big areas with exactly the same color).
Conclusion: use the right method on the right picture (and at the right
time!)
Greetings from Brazil!
--------------------------------------------------------------
Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
[EMAIL PROTECTED] "The measure of success is the knowledge"
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