MGMT 1000 Lecture Notes - Lecture 11: Gif, Image Resolution, Lossy Compression
MGMT 1000 Tutorial 11 Notes – Object Images
Introduction
• JPEG employs a lossy compression algorithm to reduce the amount of data stored and
transmitted.
• The algorithm used reduces image resolution under certain circumstances, particularly
for sharp edges and lines.
• This makes JPEG more suitable for the representation of highly detailed photographs
and paintings.
• GIF is preferable for line drawings and simple images.
• Other formats include TIFF, which is popular on Macintosh platforms, BMP, a Windows
format, and PCX, a format originally designed for use with PC Paintbrush software.
• PNG is a recent format that eliminates many GIF and JPEG shortcomings.
• It is intended to replace GIF and JPEG for many Internet applications.
• When an image is made up of geometrically definable shapes
• It can be manipulated efficiently, with great flexibility, and stored in a compact form.
• Although it might seem that such images are rare, this turns out not to be the case.
• Object images are made up of simple elements like straight lines, curved lines (known as
Bezier curves), circles and arcs of circles, ovals, and the like.
• Each of these elements can be defined mathematically by a small number of
parameters.
• For example, a circle requires only three parameters, specifically, the X and Y
coordinates locating the circle in the image, plus the radius of the circle.
• A straight line needs the X and Y coordinates of its end points, or alternatively, by its
starting point, length, and direction.
• And so on.
• Because objects are defined mathematically, they can be easily moved around, scaled,
and rotated without losing their shape and identity.
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