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Introduction to raster graphics

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Presentation on theme: "Introduction to raster graphics"— Presentation transcript:

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


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