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Graphic Images 101
Painted on a grid
Drawn mathematically
Categories of Graphics
BITMAP an image created with pixels—small squares of color; quality determined by resolution; resizing distorts the image; also known as a raster graphic
object is drawn mathematically; resizing recalculates the formula; no loss of quality
VECTOR
Vectors• Vector graphics are DRAWN,
not painted.• Vectors retain quality when
resized• The drawing tools in Publisher,
PowerPoint, PhotoShop and Word create vectors.
• Adobe Illustrator is a drawing program
Clip Art• Windows metafiles. If you can
take the image apart, you may well be working with a metafile. The file format is .wmf.
• A metafile is a Microsoft version of a vector graphic
Other vectors• Graphs / charts
(Excel)• Scalable fonts
TimesNewRoman
TimesNewRoman
Types of Bitmaps
• .bmp• .jpg• .gif
• .tif• .png
.bmp• Largest graphic file
size,generally not compressed• Supports 16.7 million colors• Files created in PAINT are
typically bitmaps• Do not send as attachments
.jpg• Best choice for photos• Compressed file format• Supports 16.7 million colors• Appropriate for web pages• Does not support
transparency
.gif• Compressed file format• Supports:
– Transparency– Animations– 256 colors
• Appropriate for web pages• Best choice for graphic images
.tif• Not compressed—large file
size• Supports 16.7 million colors• Can be used for photographs• Not appropriate for web pages
or attachments
.png• Compressed file format• Supports:
– Transparency– 16.7 million colors– Animation
• Excellent for photos
.bmp 4.21 MB .gif 657 KB
.jpg 360 KB .tif 4.21 MB
Bitmap Software
• To create: use a painting program, digital camera, scanner
• To edit: use a digital imaging program like Photoshop, GIMP, Picassa.