Images CS418 Computer Graphics John C. Hart Vector v. Raster - - PowerPoint PPT Presentation

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Images CS418 Computer Graphics John C. Hart Vector v. Raster - - PowerPoint PPT Presentation

Sep 24, 2023 778 likes •877 views

Images CS418 Computer Graphics John C. Hart Vector v. Raster Graphics Vector Graphics Raster Graphics Plotters, laser displays TVs, monitors, phones Clip art, illustrations Photographs PostScript, PDF, SVG

slide-1
SLIDE 1

Images

CS418 Computer Graphics John C. Hart

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SLIDE 2

Vector v. Raster Graphics

Vector Graphics

  • Plotters, laser displays
  • “Clip art,” illustrations
  • PostScript, PDF, SVG
  • Low memory (display list)
  • Easy to draw line
  • Solid/gradient/texture fills

Raster Graphics

  • TV’s, monitors, phones
  • Photographs
  • GIF, JPG, etc.
  • High memory (frame buffer)
  • Hard to draw line
  • Arbitrary fills
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SLIDE 3

Rasterization

3

Vertices Pixels Fills Aliasing Primitives

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SLIDE 4

Scalable Vector Graphics

<svg height=“500px” width=“500px” viewbox=“0 0 1 1”> <path d = “M 0.2 0.0 L 0.2 0.2 L 0.4 0.2 L 0.4 0.8 L 0.2 0.8 L 0.2 1.0 L 0.8 1.0 L 0.8 0.8 L 0.6 0.8 L 0.6 0.2 L 0.8 0.2 L 0.8 0.0 Z” fill = blue /> </svg>

(0,1) (1,1) (1,0) (0,0)

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SLIDE 5

Raster Images

  • 2-D Array of Color Values
  • Spatial Resolution: HRES × VRES
  • Image Aspect Ratio:

HRES/VRES (HDTV = 1920/1080 = 1.78 = 16:9)

HRES VRES

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SLIDE 6

Raster Images

  • 2-D Array of Color Values
  • Spatial Resolution: HRES × VRES
  • Image Aspect Ratio:

HRES/VRES (HDTV = 1920/1080 = 1.78 = 16:9)

  • Pixel Aspect Ratio:

(height/width) / (HRES/VRES) Square pixels are 1:1

HRES VRES width height

slide-7
SLIDE 7

Raster Images

  • 2-D Array of Color Values
  • Spatial Resolution: HRES × VRES
  • Image Aspect Ratio:

HRES/VRES (HDTV = 1920/1080 = 1.78 = 16:9)

  • Pixel Aspect Ratio:

(height/width) / (HRES/VRES) Square pixels are 1:1

HRES VRES width height HRES/2 VRES

slide-8
SLIDE 8

Raster Images

  • 2-D Array of Color Values
  • Spatial Resolution: HRES × VRES
  • Image Aspect Ratio: HRES/VRES

(HDTV = 1920/1080 = 1.78 = 16:9)

  • Pixel Aspect Ratio:

(HRES/VRES) / (height/width) Square pixels are 1:1

  • Color Resolution (bits per pixel)

1 bpp: 8 bpp: = 24 bpp: = #FF6D55

HRES VRES 1 1 1 0 1 1 0 1 1 width height VRES HRES/2