Scanner	Digital Camera	Monitor/TV	Desktop Printer	Press
Bit Measurement	spi (samples per inch)	dpi	ppi (pixels per inch)	dpi (dots per inch)	lpi (lines per inch)
Typical Resolution	600 flatbed 400 handheld	600 capture; final output 640x480 pixels	72 or 75; screen setting in pixels divided by monitor size	300 to 600	1200 +
Color Model	RGB, bitmap	RGB	RGB	RGB	CMYK

 

Image	Format	Extension	Where Used
Color, Grayscale,	Bitmap: up to millions of colors indexed color up to millions of colors	TIF, TIFF* BMP, PCX, PICT GIF JPG, JPEG	printing press on-screen internet internet
	Object oriented: up to millions of colors	EPS WMF	Postscript printer printing press desktop printer
Line Art	bitmap, 1 bit	BMP, PCX, PICT	on-screen desktop printer

*Hint: Three letter extension means PC format, four letter extension means MAC format.

 

Bit Depth	Color	Distribution	Image Type
1	No	Black and White 21	Line art Halftone
8	No 256	Black, 254 shades of Gray, White Palette limited to Black*, 10 shades of Gray, White*, and 214 colors. 28	Grayscale Indexed color
24	millions	256 shades each of Red, Green, and Blue* (28)3	Full color

 
* Black = R0, G0, B0   White = R255, G255, B255

© Donna Ford 2000