Computer imaging concepts 1.

Types of graphic images-Bitmaps and Vector

• Image-editing programs are designed to work primarily with bitmapped images and are used for photographs or painted images.

  • Bitmaps  (raster images) are made up of an array of thousands or millions of pixels.

  • They are larger files than vector produced files.
  • They are resolution-dependent, so that when magnified they appear jagged. 
  • Creates softer images and images can be transparent.
  • CorelPaint™, Microsoft Photo Editor™ and Photoshop™  are examples of bitmap editing programs.
  • TIF, BMP, JPG, GIF, PSD files

• Illustration programs are designed to handle vector graphics and are best  used on the internet because of the small file size.
  • Vector graphics are made up of objects such as shapes, lines, and fonts, which are defined mathematically, not by pixels.
  • Vectors are better suited to graphics composed of basic shapes, as in a corporate logo. The files are smaller in size than are bitmap files.  
  • They are resolution-independent, so they can be shrunk or magnified with no loss of detail.
  • Illustrator™, Freehand™ and CorelDraw™ are examples of vector editing programs.
  • EPS,  CDR,  AI (Illustrator) files.
     
• Hybrid programs--combine both vector and raster technology--Macromedia Fireworks™-PNG files.

Graphics Image Programs Used in Dentistry.

Bitmap (raster) imaging programs in Dentistry are designed for images obtained from input devices such as scanners, digitized x-rays, intraoral cameras,  dental caries diagnostic programs (laser technology) and periodontal disease evaluation through intra-sulcular viewing. 

These input devices are able to integrate graphics with window based practice management software.  They allow for rapid and easy to use tools for seeing and manipulating the resulting graphics of the various input devices. 

They should have many of the tools found in bitmap-imaging programs such as CorelPaint™ and Photoshop™.

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