17 terms

Image file formats

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Most common image file types
- GIF (a compressed, 'lossless' format)
- JPG (a compressed, 'lossy' format)
- PNG (predominantly 'lossless')
- TIFF (can be lossy or 'lossless')
Most common WEB GRAPHIC image formats:
- GIF (limited to 256 or fewer colors)
- JPG
- PNG (in some cases, with certain caveats)
Which of the following is a native
Adobe Photoshop file format?
PSD
Raster (a.k.a. bitmapped) format
- a simple grid of colored dots
Vector format
- contain data stored in mathematical formats rather than bits of
colored dots
- can be blown up or down (a property known as "scalability")
without looking jagged ("pixilation") or crowded
Meta format
Includes both vector and bitmap information
- Often, when people say vector, they mean meta
Advantages of Vector/Meta files
• Can convey large amounts of information
efficiently
• Is scalable
• Makes extended, complex animation over the
web feasible
• Can be converted ("printed out") as a raster
image file
The PNG format
A lossless, bitmapped file; and an improvement on the GIF
- Newer standard, not supported by some of the older browsers
• Adobe Fireworks uses the PNG extension (.png) for its
native file format.
- The Adobe Fireworks PNG is a meta file that stores vector
information, as well as information about work flow layers, and
more.
- Fireworks PNG should NOT be used on the web
- 'Flattend' (optimized) PNG may be used on the web
GIF
• Good for flat, solid colors
• Used in logos or graphics with minimal color
gradients
• Can incorporate simple animation
• Can have a single color transparency
JPG
• Good for flat, solid colors
• Used in logos or graphics with minimal color
gradients
• Can incorporate simple animation
• Can have a single color transparency
A format for still images and
animations limited to 256 colors?
GIF
Image files are measured in kilobytes,
also called the ___ of the file
Weight
This is equal to 1,024 bytes
Kilobyte
The amount of information in an
image is also called ____.
Resolution
The native file format for Adobe
Fireworks is ____.
PNG
File format used for photographic
images?
JPG
The JPEG file format stands for...
1. Joint Photographic Experts Group
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