What is Optimization? Why Resize Images?

Why Resize Images for Web Pages?

If you have ever sent or received photos via email or attached them somewhere on the web, you know that image size can be a problem. Some websites only allow small images so they load faster and consume less memory, and getting an email with a huge image can be very annoying.  This is why we "resize" our images.  The aim of optimization is to reduce the time it takes to access a website (or run a program).

The time it takes for a webpage to display is affected by a number of factors:

  • number (and filesize) of images used on the webpage
  • structure of the underlying XHTML code, for example; setting height and width attributes enables the browser to reserve the correct amount of space for an image (before it has downloaded) avoiding the browser redrawing the webpage
  • browser’s rendering engine (how the program is used to access the web loads on each webpage)
  • browser caching: if the webpage, images, stylesheets, etc. are stored locally they do not need to be downloaded
  • user’s connection speed (i.e. dial-up modem will take longer to download a webpage than a cable modem)
  • speed of the server hosting the website
  • Internet traffic

More information on TechHub

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