.. -*- coding: utf-8; -*-

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 Measurement
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.. contents::
   :local:

dpi
===

Dots per inch.

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

ppi
===

pixels per inch, pixel density.

====== =========== ===
 Inch  Resolution  ppi
====== =========== ===
  17"   1280x1024   96
  19"   1280x1024   86
  19"   1600x1200  105
  21"   1600x1200   95
   2"    240x320   196
====== =========== ===

  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