Posted: 15/07/2013 at 09:01
with picasa its really easy. But maybe I should explain this url thing
for example this page has the url of
http:// is the type of connection its normally http or https
the s in https stands for secure and is encripted which means as the page gets passed from computer to computer it can't be read by one of the computers in the middle ordinary pages are not encrypted but https you would use when transfering things like credit card details.
www.gardenersworld.com is the public address of the website a DNS server (Dynamic Name Server) translates that to a network address to find the computer with the webpage. the rest is like the folder system used on your computer you can think of it like
C:\forum\talkback\photos\ actually more like C:\www\forum\talkback\photos\
is this actual webpage which is a plain text file but written in a specific format. within the html file are more urls usually at least one css style sheet (which tells your browser what font size to use where to put pictures ect)
Pictures are not part of the html of the page but separate files for example my avatar is at
if you click on the above link you will see just my avatar image no page links no text just the image.
because gardenersworld is such a big site it has to divide the load between several servers(computers) s3 is one particular computer s3 = server3 and as you can see its got the same sort of directory structure as the server which holds the html page.
just like your own computer you probably have c:\usersandsettings\jean\mydocuments\photos\apicture.jpg
why do this with pictures? well simply it is more efficient the gardeners world website stores just one copy of my avatar and reuses it everywhere its needed. twice on this page for example if my picture was actually part of the web page (87112.html) your browser would be having to load more data and the page would be slower. This way your browser fetches the image once and displays it twice (on this page). Not only that but your webbrowser can scale the image so it could be 300 x300 at one part of the page but also 150x150 at another.
the url is pretty much identical to an address like
12 high street
for the postal service. they work the address backwardsso to send a postcard from spain.
first put it on a plane to the uk, then send it to lincolnshire and on to the lincoln sorting office and then give it to the postman who has the high st on his route. who puts it in the letter box of number 12. computers go a little further and might include the mantlepiece in the livingroom as the exact place for that postcard to go to.
Hopefully this makes a bit more sense to you now. A url is an address which gives the location of something like a picture or a text file or a video or a soundfile ...
so to find the address of a picture on a webpage a right click on the picture brings up a little menu with a few options usually there are at least view image, copy image, copy image location (which is the url or address of the image which is what you need) so select copy image location and the address is copied to the clipboard now go to the tree icon and click that