GraphicsTheory图形学理论

1、Graphics Theory,Learning Objectives,Learn about use of graphics & their importance Identify what makes a good graphic & why Recognise different graphic formats,Starter Task,Can you name these graphics and logos below?,1.,2.,3.,4.,5.,6.,8.,9.,10.,11.,12.,7.,What are graphics?,A picture is worth a tho

2、usand words A graphic is a visual representation of a word/s or occurrence/event Graphics can be paper-based or electronic Virtually all graphics today are electronic,Why are they so important?,Eye catching image that captures a persons interest within an instant Can be more powerful than text Can b

3、e a representation of an organisation, e.g. a company logo or football team badge,JPEG,JPEG stands for Joint Photographic Experts Group. It is basically a compression tool for images.,BMP,A bitmap image defines the colour of every pixel in the image. Good for high quality images but it uses a lot of

4、 memory.,PNG,The Portable Network Graphics (PNG) format is one of the most recent formats. This format was created as freeware.,GIF,Graphics Interchange Format GIF is a common way of compacting bitmap images.,Vector vs Bitmap,Which graphic loses quality when resizing?,Compression,Lossless Image,Loss

5、y Image,The software,There are many types of software for image Manipulation, the most commonly used are: Jasc Paint Shop Pro Macromedia Fireworks Adobe Photoshop,Pixelation,Pixelation is an effect caused by displaying a bitmap at such a large size that individual pixels, are visible to the eye.,Pix

6、elation 2,Early graphical applications ran at low resolutions with a small number of colours, and had visible pixels. The resulting sharp edges gave curved objects and diagonal lines an unnatural appearance.,Anti - Aliasing,Anti-aliasing is the process of blurring sharp edges in pictures to get rid of the jagged edges on lines. After an image is rendered, some applications automatically anti-alias images.,Original image,Anti aliased image,Your mission!,Name 4 common . Explain what lossy and lossless