<ul><li>1.What is the difference between a vector based image and a bitmap (or raster) based image? Find some examples, save them, and note the differences between them. </li></ul>Vector based images contain elements such as curves and shapes of various colours. File names for vector-based images are EPS, AI. Vector based files are more suitable for illustrations that require precise measurements. Each bitmap-based image is mapped into a grid and the size depends on the image's resolution. A bitmap-based image is like a mosaic of pixels with each pixel holding a specific color value. Bitmap based files are more suitable for photo-realistic images that require complex color variations. File names for bitmap-based images are PSD, JPG. In general, bitmap-based files require more computer memory for file storage than vector-based files.
<ul><li>What is the difference between a GIF formatted file and a JPEG? Why are these different and to what different purposes are they suitable for? </li></ul>GIF files can be used for images that have a small number of colors i.e.256 colours. The GIF format is not suitable for photographic images. JPEG images are usedfor photographs and other images that have millions of colors. It allows you to create smaller graphics by losing some of the quality of the image. The JPEG format is not suitable for images with text, large blocks of solid color, and simple shapes with crisp edges. As the image is compressed it may blur resulting in an image that is not as sharp.
<ul><li>What is the difference between and embedded graphic (image) and a linked graphic (image) in a Word or Powerpoint document? Which is the default (the one that happens if you just 'paste it in') and why is this important? How did you find out? </li></ul>A linked graphic is connected to, but remains independent of, the document, resulting in a smaller document. It can be modified but individual components cannot be edited. Embedded graphic can be copied into the document at full resolution, resulting in a larger document. You can update the document whenever you like. Embedded graphics are the default graphics. You can paste embedded pictures if you don’t intend to change them. If you need to be able to modify the image you can paste in a linked graphic instead. (google book search Excel 2007: The missing manual)
<ul><li>What is a 'colour palette'? Give an example of a file with a small palette and an example of one with a large palette. </li></ul>
<ul><li>What is lossless compression? Do JPEG format files normally use this? Why is it important? </li></ul>This is storing images and graphics by using less memory
<ul><li>What does the FBS skills wiki say about using PNG files? (see the link in the top level for these sessions). Are there other new file formats to keep an eye on? </li></ul>Portable Network Graphics was initially design for use on the internet. PNG is a bitmapped image format which was created to replace the GIF format, as it compresses better and uses a higher colour depth. It was created in 1995. It can be used with grey scale or pallette based images. ( http://en.wikipedia.org/wiki/Portable_network_graphics )
<ul><li>What is BAD about using .bmp format files in your work? Why should you try to avoid this? </li></ul>
<ul><li>What is Flickr? Why might someone use this resource? Does it have an academic use or is it purely recreational? </li></ul>Flickr is a popular website for people to share personal photographs. It can be used for teaching and support purposes, and people are beginning to use it as a tool to share pictures relevant to their teaching/research. Images can be easily uploaded onto flickr in a web form. Images uploaded to flickr can be private or public so you have control on who gets to view your pictures. It is a useful tool for families and friends to keep in touch. (http://www.hca.heacademy.ac.uk/resources/site_of_the_month/index.php )