2.01 Understand Digital Raster Graphics
Also called bitmap graphics
Consist of grids of tiny dots called pixels
Have a fixed resolution and cannot be resized without altering image quality
Edited in paint programs
Can support high color depths. Most common type of raster is a digital
photograph. Great for adding special effects. Work well for web design. Used to create images for print design.
3
Native File Formats: file formats that are default file format that are proprietary to a specific program that are generally not meant to be used with other software.
Standard File Formats: file formats that can be used with a variety of software programs. Standard file formats are usually created by using the “Save As” command or through exporting. Standard file formats include, but are not limited to: .gif, .jpg, .png, and .tif.
4
PSD JPEG GIF
PNG TIFF PDF
Native file format for Adobe Photoshop
Supports transparency
Supports layers, text, and effects
Large file sizes. Industry standard
for raster graphic editing
1.01 Investigate graphic types and file formats.
6
Standard format for animation on the Internet
Supports transparency Lossless compression Colors = 256 (8-bit)
Most common format for: Text Clip art, animations,
icons, logos Simple diagrams, line
drawings Graphics with large
blocks of a single color Graphics with
transparent areas Images displayed on
computer screens and on websites.
X Does not support animation or transparency
X Lossy compression. Colors – 16.7 M (24-
bit) High quality
Commonly Used For: Desktop publishing
photographs Photographs and
natural artwork Scanned photographs Emailing photographs Digital camera
photographs
X Does not support animation
Supports transparency Lossless compression Supports multiple
color depths PNG 8 – 8 bit color
Small Graphics PNG 24 – 24 bit color
Basic Graphics
Commonly Used For: Replacing GIF and
TIFF images Online viewing of
images See examples at
http://graphicssoft.about.com/od/freedownloads/l/blfreepng07.htm
X Does not support animation or transparency
Available in compressed (lossless) and un-compressed formats
Compressed is advised Colors – 16 M (24-bit)
Commonly Used For: Storage container for
faxes and other digital images
To store raw bitmap data by some programs and devices such as scanners
High resolution printing
Desktop Publishing images
Open source, platform independent format that embeds fonts, images, layouts, and graphics
Allows choice of lossy and lossless compression
Supports 16 million colors
Viewable with Acrobat Reader, a free program by Adobe
Commonly used for: Sharing files regardless
of available software Share files that can be
protected from copying or editing
Publishing electronic documents and ebooks
1.01 Investigate graphic types and file formats.
11