1. 1.01 Investigate graphic types and file formats.
Raster Graphics
1.01 Investigate graphic types and file formats.
1.01 Investigate graphic types and file formats.

2. Raster Graphics Also called bitmap graphics
Consist of grids of tiny dots called pixels
Have a fixed resolution and cannot be resized without altering image quality
Edited in paint programs
Notice the pixels
Bitmap enlargement
Image source:
1.01 Investigate graphic types and file formats.

3. Raster Formats GIF JPEG BMP PNG TIFF
1.01 Investigate graphic types and file formats.

4. GIF – Graphics Interchange Format
Animation – Standard format on web for animation
Streaming – yes
Transparency – yes
Lossless
Colors = 256 (8 bits)
Most common format for:
Text
Clip art, animations, icons, logos
Simple diagrams, line drawings
Graphics with large blocks of a single color
Graphics with transparent areas
Screen display
Animated Gif
1.01 Investigate graphic types and file formats.

5. JPEG – Joint Photographic Experts Group
JPEG is a compression scheme (method), not a file format
Standard use for:
Desktop publishing
Photographs, natural artwork
Scanned images
Website backgrounds and borders
ing images
Digital camera memory cards
Animation – No
Transparency – No
Streaming – yes
Lossy compression
16 M colors – display capacity
High quality; large file size
1.01 Investigate graphic types and file formats.

6. BMP - Bitmap Lossless 256 colors
Large file size - not well suited for transfer across the Internet or print publications
Common uses:
Editing raster graphics
Creating icons and wallpaper
Screen display
Icons
1.01 Investigate graphic types and file formats.

7. PNG – Portable Network Graphics
Streaming – yes
Transparency – yes
Lossless
256 colors
Not suited for photographs
Widely supported by web browsers and image viewers/editors
Uses
Replace GIF and TIFF images
Online viewing of images and websites
See examples at
1.01 Investigate graphic types and file formats.

8. TIFF – Tagged Interleave Format
Available in compressed and un-compressed formats; compressed is advised
Uses
Storage container for faxes and other digital images
To store raw bitmap data by some programs and devices such as scanners
High resolution printing
Desktop publishing
1.01 Investigate graphic types and file formats.