MGMT 1000 Lecture Notes - Lecture 15: Application Software
MGMT 1000 Tutorial 15 Notes – Representing Characters as Images
Introduction
• The expanded slice includes a shadow to improve its appearance.
• Each slice of the pie is drawn using a procedure called wedge.
• The shadow is drawn by drawing the wedge three times, once in black, then moved a bit
and drawn in white and as an outline.
• PostScript is a format for storing images in object form.
• Nonetheless, there are occasions when it is necessary to embed a bitmap image into
what is primarily an object-based image.
• PostScript provides this capability.
• It even provides the ability to crop, enlarge, shrink, translate, and rotate the embedded
bitmap images, within the limits of the bitmap format, of course.
• The representation of character-based data in typical modern, graphically based
systems presents an additional challenge.
• In graphically based systems it is necessary to distinguish between characters and the
object image-based representations of characters, known as glyphs.
• Individual glyphs are based on a particular character in a particular font.
• In some cases, a glyph may also depend on neighboring characters.
• Should the data be represented and stored as characters or as glyphs?
• The answer depends on what the text is to be used for.
• Most text is processed and stored primarily for its content.
• A typical word processor, for example, stores text as character data, in Unicode format
• Fonts are embedded into the text file using special sequences of characters stored with
the data, often in a proprietary file format supported by the particular application
software.
• Conversion of the character data to glyphs for presentation is known as rendering and is
performed by a rendering engine program.
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