1. Raster vs Vector Graphics And Other Digital Terms

2. Raster Graphics Graphics made up of tiny squares Squares are called “pixels” Pixel is short for picture element Not scalable

3. What Happens When a Raster Graphic is Resized? The sizes of the pixels change If the image is enlarged, then the pixels become bigger The image loses resolution and detail

4. Example Raster Vector

5. Raster File Formats BMPBitmap – Not used for commercial printing GIFGraphical Interchange Format – Uses only 256 colors JPEGJoint Photographics Expert Group General purpose format. Uses smaller file size. Reduces image quality. TIFFTagged Integrated File Format – Large files. Professional printing.

6. PNGPortable Network Graphics – professional publishing PSDPhotoshop Document Other important file extensions: PDFPortable Document Files DOCWindows Document – Microsoftword processing EXEExecute Raster File Formats

7. Vector Graphics The computer stores the information as lines and curves Created using math formulas Example: The computer does not remember what the circle looks like. It remembers the center point and area of the circle and then redraws the image.

8. Example Revisited Raster Vector

9. Which Image Type to be Used? Will the image be resized? Line drawings or realistic images? File size – large or small?

10. Rastor Images are easily edited Realistic images, photographs Stored as pixels Pixelates when enlarged Large file size

11. Vector Manipulate shapes with precision Line drawings, maps, cartoons, diagrams Stored as math formulas Can resize with excellent clarity Small file size