Assignment 3 Graphic File Formats

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Assignment 3 Graphic File Formats

• By Pamela Dalton
• psbd_at_vt.edu
• July 20, 2004

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Image Files
Windows Bitmap (BMP)
Encapsulated Postscript (EPS)
Tagged Image File Format (TIF, TIFF)
Macintosh Picture (PICT, PCT)
Potable Network Graphics (PNG)
PC Paintbrush (PCX)
Potable Document Format (PDF)
Joint Photgraphic Experts Group (JPG)
Photoshop Document (PSD)
Graphics Interchange Format (GIF)
Truevision Targa (TGA)
Windows Metafile (WMF)
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Characteristics of Files
File Type Compressed (Yes or No) Approach Employed (Lossless or Lossy) Extent of Compression
BMP Both Windows 3.0 and later support RLE compression RLE Compression of 4 and 8 bits per pixel
EPS No
GIF Yes LZW Highly compressedsupports up to 8-bits/pixel
JPG Yes Lossy Compression ration 51, 151
PCT No
PCX Yes RLE Supports 1-24 bits/pixel
PDF No
PNG Yes RLE Supports 1-24 bits/pixel
PSD No
TGA Both RLE Supports 1-32 bits/pixel (typical 8, 16,24, and 32)
TIF Yes RLE and LZW Supports 24-bit/pixel
WMF No
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Use of Image Files
File Type Viewable in PowerPoint Viewable in Web Browser Stand Alone Viewer Used
BMP Yes Yes
EPS No No
GIF Yes Ye
JPG Yes Yes
PCT Yes No MS Picture IT
PCX No, though PowerPoint prompts user to install graphics software available on installation CD No MS Picture IT
PDF No No Adobe Photoshop
PNG Yes Yes
PSD No No Adobe Photoshop
TGA No No MS Picture IT
TIF Yes No Adobe Photoshop
WMF No No
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Conclusion

• For best access of files by the learner, I will
  primarily use BMP, GIF, or JPG image files. All
  of these file types are viewable within
  PowerPoint and the Web without requiring any
  other software and images can have compression
  capabilities that will allow smaller image sizes
  that use less memory space, as well as increase
  download times.