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Computer Graphics Zooming

Computer Graphics Zooming with Computer Graphics Tutorial, Line Generation Algorithm, 2D Transformation, 3D Computer Graphics, Types of Curves, Surfaces, Computer Animation, Animation Techniques, Keyframing, Fractals etc.

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Computer Graphics Zooming

Zooming is a transformation often provided with an imaginary software. The transformation effectively scales down or blows up a pixel map or a portion of it with the instructions from the user. Such scaling is commonly implemented at the pixel level rather than at the coordinates level. A video display or an image is necessarily a pixel map, i.e., a collection of pixels which are the smallest addressable elements of a picture. The process of zooming replicates pixels along successive scan lines.

Example: for a zoom factor of two

Each pixel value is used four times twice on each of the two successive scan lines.

Figure shows the effect of zooming by a factor of 2.

Computer Graphics Zooming

Such integration of pixels sometimes involves replication using a set of ordered patterns, commonly known as Dithering.

The two most common dither types are:

  • Ordered dither.
  • Random dither.

There are widely used, especially when the grey levels (share of brightness) are synthetically generated.

Computer Graphics Zooming
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