best size for web pics

Greetings,

I want to post some pics to the web. What size should I use to
best ensure that pics will load up quickly for dial-up. Size in
pixels, or resolution would help. Freeware programs that would
do this would be great too.

Thanks, Mark

Viewers need to see thumbnails first then click for larger images.
Are you creating your own web site or using a photo sharing site?

--
Joan
http://www.flickr.com/photos/joan-in-manly

"Kram" wrote in message
.. .
: Greetings,
:
: I want to post some pics to the web. What size should I use to
: best ensure that pics will load up quickly for dial-up. Size in
: pixels, or resolution would help. Freeware programs that would
: do this would be great too.
:
: Thanks, Mark

On Fri, 13 Oct 2006 23:35:21 -0500, Kram wrote:

I want to post some pics to the web. What size should I use to
best ensure that pics will load up quickly for dial-up. Size in
pixels, or resolution would help. Freeware programs that would
do this would be great too.

No, size in pixels or resolution wouldn't help because a given
pixel/resolution size can be expressed as a number of different
physical file sizes, depending on the amount of jpeg compression
used. Figure instead the maximum time you'd want the transfer to
take given an assumed dial-up transfer rate, and then create jpeg
files of sizes that would take that maximum time (or less) to
download. A rough estimate for 50kbps would be a little more than
three minutes per megabyte, or 10+ seconds per 50kb file. Most of
the modems I've tested, even when reporting a 50+ kbps connection
actually do sustained transfers at about 2/3 that rate (Win modems,
the ones most often used are the worst), so you may want to keep
that in mind, and use slightly smaller files or use fewer of them on
your web pages. Make sure that even if individual files are sized
so that they load fairly quickly, you don't have so many on a page
that it takes many minutes to load the entire page, especially if
it's unlikely that people would be interested in seeing *all* of the
files on any given page. It would be better to organize your web
site to use multiple pages that make logical groupings of fewer
pictures, or make very fast loading pages that contain links to
individual images, either with or without very small versions of the
images, depending on whether it would make sense to use them.

Note: These figures are based on binary NNTP (newsgroup)
transfers. HTTP (web) transfers may be slower, and a slow web host
would further reduce the user's throughput. Before going "live",
use a few friends with "dialup" computers as beta testers, to let
you know how long pages or photos take to load, and adjust as
needed.

Photos are being posted on ebay.

Viewers need to see thumbnails first then click for larger images. Are
you creating your own web site or using a photo sharing site?

Then just follow what others do.

--
Joan
http://www.flickr.com/photos/joan-in-manly

"Kram" wrote in message
...
: Photos are being posted on ebay.
:
: Viewers need to see thumbnails first then click for larger images.
Are
: you creating your own web site or using a photo sharing site?

If they are going on ebay, don't they have a limit on their size? They
automatically select it.

Joan wrote:
Then just follow what others do.

--
Joan
http://www.flickr.com/photos/joan-in-manly

"Kram" wrote in message
...
: Photos are being posted on ebay.
:
: Viewers need to see thumbnails first then click for larger images.
Are
: you creating your own web site or using a photo sharing site?