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.

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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.

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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.

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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.

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X Animation – No X Transparency – No Uncompressed 256 colors Large file size - not well

suited for transfer across the Internet or for print publications

Commonly Used For: Editing raster graphics Creating icons and wallpaper

On-screen display

Icons