1. Images

2. GIF 256 total colors Doesn't work well for highly detailed images
Photographs look grainy
Indexed color map
Array where each slot holds an RGB color
Each pixel of image points to a slot
Images

3. GIF Dithering Adaptive palette
Reducing colors in an image by creating patterns of available colors that, when viewed together, resemble the original color
Black-and-white checkerboard resembles gray
Adaptive palette
Weights colors in the palette based on frequency
Images

4. GIF
8 bits - 19K
7 bits - 15K
5 bits - 9K
3 bits - 5K
Images

5. GIF
Transparent GIF
GIF89a
Normal GIF
Images

6. GIF GIF interlacing Saves GIF image in several passes
Every eighth row starting from the first
Pass 2
Every eighth row starting from the fourth
Pass 3
Every fourth row starting from the third
Pass 4
Remaining rows
Display is in same order
Missing lines might be information of initial lines
Blocky effect
Images

7. JPEG Can store any number of colors Lossy
Works well for photographic images
Doesn't work well for line art and images with large blocks of color
Images

8. Excellent Compression Excellent Image Quality
JPEG
GIF - 3K
JPEG - 6K
Excellent Compression
Fair Image Quality
JPEG - 19K
Good Compression
Good Image Quality
JPEG - 60K
Fair Compression
Excellent Image Quality
Images

9. Excellent Compression Excellent Image Quality
JPEG
JPEG - 4K
Excellent Compression
Fair Image Quality
GIF - 26K
JPEG - 12K
Good Compression
Good Image Quality
JPEG - 21K
Fair Compression
Excellent Image Quality
Images

10. JPEG
Progressive JPEG
Low to high resolution
Images

11. PNG Portable Network Graphics format Not patented 24-bit color support
Platform independence
Capability for interlacing and transparency
Color maps
Images

12. PNG Compression which works equally well for photographs and logos
Header information stored along with image
Advanced editing capabilities
Images