graphics version2

Views:
 
Category: Education
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

Slide 1:

Graphics Image Types and Properties

Slide 2:

Basic Types Vector Graphics Raster Graphics

Slide 3:

Mathematically defined objects. Only the code that describes them is saved… eg: rect 0,0,200,100,blue. Because of this a very small file size is generated independent of the size of the image on screen. Moreover image quality is not lost when a vector image is resized. Vector images are made up of separate shapes which can be separated anytime. Vector Graphics

Slide 4:

(bitmap) Comprised of individual picture elements (pixels). The drawing cannot be separated as different shapes. Each pixel in the drawing requires its own space in the computer memory. As pixels are physical entities, each takes up some of the computer resources… Because of this a raster image takes up more memory to store. Quality is lost when such images are resized. Raster Graphics

Slide 5:

Monocrome image: each pixel is either black or white. Colour image: depends on the colour depth available…from 8 bit (each pixel can be one of 256 colours) to 24 bit (one of 16.7 million colours). CLUT (colour look-up tables) are stored with bitmaps. In such tables the information about each pixel is stored. Raster Graphics Colour Capability

Slide 6:

Warning: Quality is lost! Raster Graphics Enlargement Capability

Slide 7:

Good News: Quality kept intact! Vector Graphics Enlargement Capability

Slide 8:

All web graphics excluding Flash delivery & those graphics that have a specific effect. Raster Graphics Are used for…

Slide 9:

Flash based graphics aimed at internet delivery. Web based graphics that require certain effects. Vector Graphics Are used for…

Slide 10:

Draw programs create Vector based images (e.g. Macromedia Freehand, Corel Draw and the drawing tools in MS Word, MS Publisher and PowerPoint). Vector Graphics

Slide 11:

Paint programs create raster (bitmap) based images (e.g. Paintshop Pro, MS Paint and Adobe Photoshop). Raster Graphics

Slide 12:

EPS Bitmap vector Encapsulated Postscript JPG bitmap Joint Photographic Experts Group GIF bitmap Graphics Interchange Format WMF vector Windows Metafile PNG bitmap Portable (public) Network Graphic TIF bitmap Tagged Image File Format 5.0 PCX bitmap PC Paintbrush BMP bitmap Windows Bitmaps Extension Type Format Format

Slide 13:

Support 24bit colour (true colour ). Are usually small files due to compression. Ideal for photographs whether scanned or taken by a digital camera. Also used in websites especially in photo galleries etc. JPG or JPEG Properties

Slide 14:

Properties Support 8bit colour (256 colours) Are usually small files due to the small number of colours supported. Support transparency. Support animation. Ideal for clipart and cartoons and for the internet. Not suitable for photographs or where graded colour is used. Gif

Slide 15:

PNG Properties Support 48bit colour Lossless. Support transparency . A useful alternative to both gif and jpg formats!

authorStream Live Help