Graphics

Generation of raster-scan images (cont'd)

Colour display

In digital displays, typically 8 bits for each of red, green and blue.

Amount of video memory (MBytes) required for different resolutions:

Resolution 8 bits/pixel
(256) 16 bits/pixel
(65,536) 24 bits/pixel
(‘true colour’) 32 bits/pixel
VGA¹ 640 × 480 0.31 MB 0.61 MB 0.92 MB 1.22
SVGA² 800 × 600 0.48 MB 0.96 MB 1.44 MB 1.92
XGA² 1024 × 768 0.79 MB 1.57 MB 2.36 MB 3.14
SXGA 1280 × 1024 1.31 MB 2.62 MB 3.93 MB 5.24
UXGA 1600 × 1200 1.92 MB 3.84 MB 5.76 MB 7.68
WUXGA 1920 × 1200 2.30 MB 4.61 MB 6.91 MB 9.22
NTSC TV ≤720 × 480 (240 lines interlaced)
HDTV 1280 × 720
1920 × 1080

Resolution	8 bits/pixel (256)	16 bits/pixel (65,536)	24 bits/pixel (‘true colour’)	32 bits/pixel
VGA¹	640 × 480	0.31 MB	0.61 MB	0.92 MB	1.22
SVGA²	800 × 600	0.48 MB	0.96 MB	1.44 MB	1.92
XGA²	1024 × 768	0.79 MB	1.57 MB	2.36 MB	3.14
SXGA	1280 × 1024	1.31 MB	2.62 MB	3.93 MB	5.24
UXGA	1600 × 1200	1.92 MB	3.84 MB	5.76 MB	7.68
WUXGA	1920 × 1200	2.30 MB	4.61 MB	6.91 MB	9.22
NTSC TV	≤720 × 480 (240 lines interlaced)
HDTV	1280 × 720
1920 × 1080

¹The original VGA had only 4 bits at 640×480.

²The original SVGA and XGA had only 8 bits.

R. Funnell

Last modified: Tue, 2007 Mar 20 17:33:24

Slide show generated from graph.html by Weasel 2007 Mar 21