Bob Nicholson on tue 18 mar 03
The 800x600 size John recommend is based on a standard
screen size of 800x600 pixels. Approximately 30% of current
users still have screens this size, although the percentage is
falling as larger monitors become cheaper.
But remember, if the screen is 800x600, some if the screen space
is used up by the browser buttons, menu bar, scroll bar, etc. I
recommend to my clients that they make their images NO LARGER
than 720 wide by 520 high.
The "resolution" setting on the image is irrelevant for the web;
browsers ignore it. Just pay attention to the size of the image,
in pixels.
When saving an image, you need to balance quality versus file
size; the file size determines how fast the image will download.
Using a modem, images will download at roughly 5,000 bytes
per second. So if your image file is 40,000 bytes, it will
take 8 seconds to download.
Try the MEDIUM jpeg quality setting as a starting point. Keep
a copy of your original image, saved at the highest quality. As
you experiment with different quality settings, always start
with a copy of your original image. That's because, each time
you save (compress), open (uncompress), and resave (recompress)
an image, the quality degrades... just like successive photocopies.
- Bob Nicholson
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