Web Cartography 3

Rasters & Vectors

Raster formats

JPG
PNG
GIF
...

GIF

256 colors only
transparency
logos, graphics with solid areas

JPG

16.7M colors
no transparency
lossy compression - fully adjustable
photos

PNG

16.7M colors
no transparency
lossless compression
high constrast photos, gradients, maps

Raster Data Compression

Run-length coding (lossless)
Quadtree coding (lossless)
LZ77/LZW (lossless)
JPEG (lossy)

Vector formats

SVG

machine-readable
smaller in size
animations, transitions
XML based

Web Cartography 3 Rasters & Vectors

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