Display/Graphics Information

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Display/Graphics Information

Web Graphic Formats
Type	Maximum Color Depth	Compression Type	Interlacing	Animation	Transparency	Variable Transparency	Gamma Correction	Browsers
GIF87a	8-bit	Lossless	Yes	X	X	X	X	Explorer, Navigator
GIF89a	8-bit	Lossless	Yes	Yes	Yes	X	X	Explorer 3, Navigator 2
JPEG	24-bit	Lossy	X	X	X	X	X	Explorer 2, Navigator 2
P-JPEG	24-bit	Lossy	Yes	X	X	X	X	Explorer 4, Navigator 4
PNG	48-bit	Lossless	Yes	X	Yes	Yes	Yes	Explorer 4, Navigator 4.04

Resolutions By Display Size
Display Size	640-by-480	800-by-600	1,024-by-768	1,280-by-1,024	1,600-by-1,200
14 inches	BEST	GOOD	MARGINAL	WORST	WORST
15 inches	GOOD	GOOD	BEST	BAD	WORST
17 inches	MARGINAL	GOOD	BEST	MARGINAL	BAD
19 inches	MARGINAL	MARGINAL	GOOD	BEST	MARGINAL
21 inches	BAD	MARGINAL	GOOD	BEST	GOOD

BEST - optimally readable
GOOD - acceptably readable
MARGINAL - difficult to read; pixels too small or too large
BAD - extremely difficult to read; pixels too small or too large
WORST - unreadable

RAM needed on graphics cards

(resolution vs. color depth)

Resolution	256 colors (8-bit)	65,000 colors (high color, or 16-bit)	16.7 million colors (true color, or 24-bit)
640-by-480	4 MB	4 MB	4 MB
800-by-600	4 MB	4 MB	4 MB
1,024-by-768	4 MB	4 MB	4 MB
1,280-by-1,024	4 MB	8 MB	8 MB
1,600-by-1,200	8 MB	8 MB	16 MB

Specifying Scan Rates and Refresh Rates

a monitor's vertical refresh rate should be higher than 75 Hz, but there is no reason to set it higher tha 85 Hz (waste of resources)

Resolution	vertical refresh rate at least	horizontal refresh rate at least
640-by-480 (VGA)	85 Hz	43 kHz
800-by-600 (SVGA)	85 Hz	54 kHz
1,024-by-768 (XGA)	85 Hz	69 kHz
1,280-by-1,024 (SXGA)	75 Hz	80 kHz
1,600-by-1,200 (UXGA)	72 Hz	89 kHz

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