Examining Media Elements: Graphics

By

Janice Remington

MCIS/MMIS 681 Electronic Multimedia Systems

Graduate School of Computer and Information Sciences

Nova Southeastern University

Summer 2011

Bitmap vs. Vector

Paint graphics vs. Drawn

Bitmap Most appropriate for photorealistic images and complex drawing Large file sizes, has inability to scale or resize the image easily

while maintaining quality Image’s bit depth determines the number of colors that can be

displayed by an individual pixel Can be found on a screen, scanned, downloaded from a

website, or from a video capture device Can manipulate or adjust its properties Colors will seem darker or richer

Vector Most appropriate for lines, boxes, circles, polygons, and other

graphic shapes that can be mathematically expressed in angles, coordinates, and distances

Can be filled with color or patterns, and can be selected as a single object

Uses a fraction of memory space required to describe and store the same object in bitmap form

Can be downloaded and drawn faster Can export as a bitmap Requires a plug-in for display on a web page Can not be used for photo realistic images

Pictures vs. Graphics

Vector: Graphics

Bitmap: Pictures

Compression Algorithms Lossless: in which a decompressed file is of exactly the

same size as the original file because no detail or content is lost in compression-decompression process

Lossy: in which a decompressed file is smaller in size than the original file because some detail or content is lost in compression-decompression process

File Formats GIF, JPEG, PNG: use compression

within the file JPEG, GIF: most common bitmap

formats used on the Web and may be considered cross platform

BMP, TIFF: Mostly used in Windows

File Format Acronyms

TIFF: Tagged Interchange File Format GIF: Graphic Interchange Format BMP: A Windows Bitmap Image File Format JPEG: Joint Photographic Experts Group PNG: Portable Network Graphic

File Format Definitions TIFF: a universal bitmapped image format GIF: a proprietary bitmap image format limited to a palette of

256 colors and widely used on the Web BMP: designated with the .bmp file extension JPEG: designation for a bitmap image file format widely used on

the Web for photo-realistic images, designated by the .jpg file extension

PNG: bitmap image file format created as a free alternative to the GIF format

Things to Remember Make sure your multimedia authoring

package can import the image files you produce, and that your application can export such a file

Bitmap: photo-realistic images Vector: easy to size and manipulate

images

URL Resources http://www.youtube.com/watch?v=fy9Pb

y0Gzsc http://www.youtube.com/watch?v=fy9Pb

y0Gzsc&feature=related http://www.youtube.com/watch?v=gMi1I

04ILGk&feature=related http://www.youtube.com/watch?v=XI0rf

2r-dx8&feature=related

Reference

Vaughan, T. (2007). Multimedia: Making it Work, 7th Edition. New York: McGraw Hill Technology Education.