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Pictures Formats

Formats
There are generally 3 types of image formats used on web pages – jpg, gif and png. These formats can be compressed which means their file size will be small making them easier to download over the Internet.

  • The jpg format is used for photographs as it allows for gradient colours. An example of a filename is church.jpg
  • The gif format is used for images with flat colours, like logos or clipart. An example of a filename is logo.gif
  • The png format is relatively new and allows for the colour depth of the jpg and the better compression of the gif format. An example of a filename is picture.png

Size
The size of an image on a web page is measured in pixels. A pixel is a dot of information on the computer screen – monitors today range from 800 to a 1024 pixels in width.

Big images can take a long time to download and so certain restrictions have been set in place when it comes to loading images onto your website.

The maximum width and height for images on your website will be displayed in the Picture Element popup window. Images larger than the maximum size will be resized and resampled to fit accordingly. Pictures that are smaller than the maximum size will not be affected.

Preparation
It is best practice to pre-prepare your images before going on line. If you want to put a photograph on one of your web pages then you will need to cut it down to the right size in an image-editing program (eg PhotoDraw; PhotoShop; Paint Shop Pro; Serif PhotoPlus; etc) before inserting it in your page.

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