Re: Faster Loading jpg?

by simone(at)genesisnetwork.net (Demitrius)

 Date:  Wed, 21 Jan 1998 22:09:29 -0800
 To:  "Nathan R Heagy" <rheagy(at)cyberlink.bc.ca>,
"HWG Graphics" <hwg-graphics(at)hwg.org>
  todo: View Thread, Original
Hi,

>I hope someone can correctly if I am wrong, but isn't resolution
irrelevant?
>The way that I design web pages is that the pixel is the unit of measure
for
>web sites - dpi or resolution depends on the inch as the basic unit. Does
>resolution affect picture quality in jpgs?

No, it does not. Not directly anyway. It's easy to get confused about this
because when it comes to printers, the higher the resolution (600 dpi, 1200
dpi) the sharper the output. So it would seem to make sense that the same
thing would hold true for a scanned image, right?

There's a very good website about exactly this topic at:
http://www.cyberramp.net/~fulton/brev.html

In a nutshell, when it comes to images on the computer screen, resolution
has to do with the apparent *size* of the image and not its clarity or file
size. Of course, if the pixel size of an image is say, 1000 pixels by 800
pixels, then the file size is going to be considerably larger than a 100 x
100 pixel image would be.

72 dpi, is just a number that gets images to fit on your screen. But if you
scanned that same image at 300 dpi, it would be bigger than could fit on
your screen.

Try it, you'll see what I mean.

Compression is the factor that has a direct effect on image file size.

Regards,
Demitrius >I<
------------------------------------------------A. Demitrius Lopez
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