About GUI widgets.
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* 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
* Display resolution.
Name Megapixels Width x Height
CGA 0.064 320×200
EGA 0.224 640×350
VGA 0.3 640×480
SVGA 0.5 800×600
XGA 0.8 1024×768
SXGA 1.3 1280×1024
UXGA 1.9 1600×1200
WUXGA 2.3 1920×1200