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CAP 105 Lesson 2: File Formats
Transcript of CAP 105 Lesson 2: File Formats
Used by Designers / Printers.
Created in Layers.
Can be Easily Edited (w/ proper software).
Most used to transfer image / art into another app.
Can be vector-based (scaled to any size).
Portable Document Format
Universal file type.
Preserves / embeds fonts, images, layout, etc.
Sometimes used for printing but mostly for proofs.
Usually a raster format.
Used for graphics and photos.
Commonly used by designers / printers.
Created in layers for easy editing (w/ proper software).
A rectangular pattern of parallel scanning lines followed by the electron beam on a television screen or computer monitor.
Instead of pixels, vector graphics are comprised of paths, which are defined by a start and end
point, along with other points, curves, and angles along the way.
Joint Photographic Experts Group
Compressed image file.
No transparent background.
Can be compressed as needed, but quality decreases with more compression.
Graphics Interchange Format
Low resolution files used for the web b/c they are supported by all browsers.
Compressed = small file size.
Support transparent background.
Can be animated.
Tagged Image File Format
Used for storing images, usually by professionals.
Good for high-quality images.
Reliable and compatible across most platforms.
Portable Network Graphics
Commonly used for web design due to low resolution.
Use lossless data compression (so they look good even when compressed).
Support transparent background.
Audio Video Interlaced
Old standard developed by Microsoft for Windows.
Files are large (raw).
Can have compatibility issues (due to codecs used for compression)
A piece of software that can encode or decode a digital data stream or signal. The term is actually a portmanteau of "Compressor / Decompressor"
There are hundreds of codecs in use, which can cause compatibility issues.
Flash Video Format
Good for compression while still keeping high quality image.
Used heavily online (all Youtube videos are FLV).
May soon be replaced by MP4 H.264 and HTML5
Motion Picture Experts Group
Developed in 1988.
Asymmetric; encoder is more complex than decoder (so the tech powering the video stream can improve and the decoder can still work).
Used in DVDs.
MPEG -4 Part 14
Very efficient yet still produces high quality video.
Used by most cameras / smartphones.
Recommended for uploading to Youtube.
Common Video File Formats
Windows Media Video
Originally developed for streaming video (RealPlayer)
Now used for Blu-ray
High compression (is a slideshow with digital effects applied over images) - used to compromise quality
Common Print Design File Formats
Frequently-used format for graphic design work
Native to Adobe Illustrator
Cannot be opened easily
Transfers postscript content
Combines vector and raster content
Highly-compatible between design programs - so used to transfer between
In the old days, printers could only produce ASCII characters (think "typewriter keys").
The advent of the dot matrix printer meant new characters (and images) could be created - and a language (PostScript) was needed to communicate these to the printer
Not all printers use PostScript, but they use something similar - Printer Drivers (which are programs that translate the graphics on the screen into printable code).
Native to Adobe PhotoShop
Industry standard for bitmap images (raster)
Good for photography but doesn't scale well (for images like logos)
Portable Document File
As previously mentioned - universal file type - can be compressed
embeds fonts, images, layouts & graphics (both vector and raster)
Typically used to preview work for clients or for posting to web