Laureate Online Education Internet and Multimedia Technology…

Laureate Online Education Internet and Multimedia Technology © All right reserved, 2000-2008. The Internet and Multimedia Technology module, in all its parts: syllabus, guidelines, lectures, discussion questions, technical notes, images, labs, projects and any additional material is copyrighted by Laureate Online Education B.V. Module: MSC MD (INTMMT) Seminar 3 Bitmaps and Colour Introduction We will turn our attention to Bitmaps and Colour during this Seminar. As we did in Seminar 2, we will again recommend some applications and encourage you to experiment. Bitmapped images have none of the complexity of 3D graphics and yet they are the final output from a 3D system. Often the 2D image desired will first be created in 3D and then, after the perspective transformation is applied and it becomes 2D, modified and enhanced. Let us take a look at some ideas associated with Bitmaps. We start with the resolution or measure of the granularity of the image. It is a common error to assume that an image having 640 by 480 pixels on the screen cover s only that number of phosphor dot triads on the face of the monitor. A screen may state it provides so many dots per inch as its resolution. This is a measure of the manufacturing quality. Depending on the size of the screen we will have a different number of dots per pixel for a given computer resolution. It is also rather short sighted to keep an image at a small resolution since it will look very ‘blocky’ if enlarged or viewed at a greater resolution than originally stored. This gives rise to large files being kept just in case we need the resolution! One obvious way around this is to compress the image. Compression schemes are considered to be of two types; Lossy and Lossless. With lossless compression we can always regain the original quality whereas with lossy compression we sacrifice some aspect of quality depending on the application. When dealing with multimedia and the Internet we are very concerned to obtain the best…