1. Introduction to raster graphics
Emily Scoggins
Wakefield High School
Raleigh, NC

2. 2 Types of Graphics
Vector
Raster

3. Examples of raster graphics

4. Raster Graphics Also called Bitmap Graphic
Raster graphics are from small squares of specified color called Pixels on a grid to create a graphic image
Best for Photography
Loses clarity when zoomed in
Edited in Painting programs
ex. Adobe Photoshop or Paint

5. Why Use raster graphics?
Best for Photographs or photo-realistic images
Supports complex color or full color
Can be compressed easily

6. Disadvantages of raster graphics
Larger file size
Depending on resolution, the higher, the larger the file size
Resolution Dependent
As you increase the size of a Bitmap image, the resolution will reduce
Resizing images can reduce quality
Information is lost each time a bitmap is saved

7. raster file formats .JPEG – Joint Photographic Experts Group
Typically used for photographs and complex images
Full color, but loses quality as you zoom in
Most popular file type for images
.PNG – Portable Network Graphic
Supports complex transparency, higher quality
.GIF – Graphics Interchange Format
Simple images, only 256 colors but supports simple transparency