Measurement

dpi

Dots per inch.

• http://en.wikipedia.org/wiki/Dots_per_inch

ppi

pixels per inch, pixel density.

• http://en.wikipedia.org/wiki/Pixels_per_inch

lpi

lines per inch.

• http://en.wikipedia.org/wiki/Lines_per_inch

bpp

bits per pixel, color depth.

• 1 bpp, 2 colors (monochrome)
• 2 bpp, 4 colors
• 3 bpp, 8 colors
• 8 bpp, 256 colors
• 16 bpp, 65,536 colors ("Highcolor" )
• 24 bpp, 16.8 million colors ("Truecolor")

• http://en.wikipedia.org/wiki/Color_depth