Images

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

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

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

GIF Transparent GIF GIF89a Normal GIF Images

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

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

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

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

JPEG Progressive JPEG Low to high resolution Images

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

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