Raw Graphics vs. Flat Graphics
Raw graphic files, such as PNG (Portable Network Graphic), are larger files which can be edited using photo editing software like Fireworks. These files can have multiple layers and when viewed using a photoediting software the multiple layers can still be moved around. In Fireworks these layers appear on the right side of the screen. Below is a screenshot of Fireworks with a picture of me along with 3 other background. When the file is still in graphics form the different layers can still be moved around to change the image.
Flat graphic files, like JPEG (Joint Photographic Experts Group), are much smaller in size than raw graphics files because they are a flat image. If the picture above is saved as a JPEG file it would no longer be able to be edited with the multiple layers present in the PNG file.
Images and Image Quality (Chesley Wells)
When you are searching for an image on a search engine like Google.com and you want to have the best image (pixelated)http://en.wikipedia.org/wiki/Pixel picture for your chroma-keying pictures for example. You can either enter what you are looking for and search the pictures for the largest pixels which is underneath the picture itself, and this will be depicted for example 1024 x 980. The bigger the file the more pixels it has therefore you want as large as picture as possible. To find out how large your screen is projecting you can go to the top of your screen and with a drop down it will say that it is for example at 1280 x 1024, so when you are looking for the best possible picture for this computer resolution you want to find a picture as close to those dimensions. If the picture is too small it will appear rough and pixelated. There are three different types of photos; 1) jpg's http://en.wikipedia.org/wiki/Jpgare used best for photographs and most common for this class, 2) gifshttp://en.wi
kipedia.org/wiki/Gifare better used for drawings, and 3) png's http://en.wikipedia.org/wiki/.png are rarely ever used http://www.psmicrographs.co.uk/_assets/uploads/digital-camera-ccd-sensor-pixels-sem-80200980-l.jpg
What is a Pixel? (Susan "Samm" Enman)
In order to understand the basics of images, one must first understand the basic element of image composition. The smallest element of an image is called a pixel, "pix" meaning picture and "el" meaning element. In laymen's terms, one may think of it as the smallest crumb of pie. When the pie crumbs are condensed, and the pie itself will be dense and heavy. If those same crumbs are spread out the pie becomes flaky and falls apart. Pixels are measured in dots per inch, so it stands to reason that the more dots or pixels per inch, the higher the resolution and the better looking the picture.