Graphics_Theory图形学理论

1、精选pptGraphics Theory精选pptLearning Objectives Learn about use of graphics & their importance Identify what makes a good graphic & why Recognise different graphic formats精选pptStarter TaskCan you name these graphics and logos below?1.2.3.4.5.6.8.9.10.11.12.7.精选pptWhat are graphics?A picture is

2、worth a thousand 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精选pptWhy are they so important? Eye catching image that captures a persons interest within an instant Can be more powerful

3、than text Can be a representation of an organisation, e.g. a company logo or football team badge精选pptFile Types JPEGJPEG 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 qualit

4、y images but it uses a lot of memory. 精选pptFile TypesPNGThe Portable Network Graphics (PNG) format is one of the most recent formats. This format was created as freeware. GIFGraphics Interchange FormatGIF is a common way of compacting bitmap images. 精选pptVector vs Bitmap Which graphic loses quality

5、when resizing?精选pptCompressionLossless ImageLossy Image精选pptThe softwareThere are many types of software for imageManipulation, the most commonly used are: Jasc Paint Shop Pro Macromedia Fireworks Adobe Photoshop精选pptPixelation Pixelation is an effect caused by displaying a bitmap at such a large si

6、ze that individual pixels, are visible to the eye.精选pptPixelation 2Early 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.精选pptAnti - AliasingAnti-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 imageAnti aliased image精选pptYour mission! Name 4 common file types. Explain what lossy and lossless