File Formats About graphic file formats And image compression.

File FormatsAbout graphic file formats

And image compression

There are many file formats… Graphic info can be represented as either

vector drawings… Or as raster / bitmap images… Some graphic file formats contain only

vector drawings or bitmap images… But many can include both in the same

file…

A list of graphic file formats…

BMP Bitmap EPS Encapsuted postscript Gif 89a Graphic interchange format Amiga IFF Jpeg Joint phographic Experts Group PCX PDF Portable Document Format Macintosh Pict PNG Portable Network Graphics

A list of graphic file formats… Pixar Postscript Language format TGA Targa Tiff

BMP BMP windows standard bitmap image For dos / windows Option OS2/or Microsoft windows 24 bit file format…

Encapsulated Postscript Language Print format Used to transfer postscript language

artwork between applications.. Part of the “desktop revolution”…along with

postscript printers… Can contain both vector and raster imagery

Encapsulated Postscript LanguageAdvantages of this file format…

All page layout, word processing and graphic applications accept or will allow import of eps format…

Eps files preserve all graphic elements from Adobe Illustrator…

RGB and CMYK objects remain in their respective color models…

Encapsulated Postscript LanguageAdvantages of this file format…

Illustrator files remain illustrator files, even if saved as eps….

Most applications may not be able to display the eps, but will be able to generate a preview of the file which can be used to place or size the graphic.

Gif 89 a (Graphics Interchange Format)

Web format 8 bit Index palette (256 colors) Compressed format Lossless Can save with transparency Can save with animation (slide type)

Amiga IFF Amiga Interchange File Format

Used for working with Video Toaster Part of Commodore Amiga landscape… Supported by many paint programs in the

IBM world…

Jpeg (Joint Photographic Experts Group) Web Format For display of photos and other continuous

tone imagery…. Jpeg retains all color info in RGB image… Uses compression called lossy… Reduces file size by identifying and

discarding extra data not essential to display of image

Jpeg (Joint Photographic Experts Group) Lossy compression means… Once an image has been compressed and

then decompressed no longer identical to original image….

Higher image compression/ lower image quality

lower image compression/ higher image quality

PCX by Z-soft On screen display… Created for PC Paintbrush application… Commonly used by IBM/PC compatible

Computers…

PDF (Portable Document File) Web and Print used by Adobe Acrobat For Windows, Macs, Unix and DOS… View with plugin called Adobe Acrobat Reader…. Also based on postscript level 2 (like eps)… Can also contain electronic document search and

navigation features (think Hyperlink)…

Pict (Macintosh) Graphics and page layout… Mac environment… Generic Mac format…

Pixar Video format Pixar animation company John Lassiter

(Toy Story, Monsters Inc…) High end graphics, Three dimensional imagery

PNG (Portable Network Graphics) Web format Designed to replace gif Uses lossless compression scheme like

gif.. Has transparency like gif, actually more

sophisticated… Never quite caught on, needs a plugin to be

displayed in browser settings…

PNG (Portable Network Graphics) Has two flavors Png 8 similar to gif Png 24 similar to jpg… Default file format for Macromedia

fireworks… Can be imported into flash with no hitch…

TGA (Targa) Video format MS-Dos color applications…

Tiff (Tagged-Image File format) Primarily print… Extremely flexible…Supported by virtually all

paint, image editing and page layout applications…

Also supported by almost all desktop scanners… Supports Greyscale, RGB and CMYK color

modes… Choose version compatible with Mac or PC,

choose LZW compression…

Image Compression Storage for images is a combination of… Image size… Resolution… Bit depth…

Bitmap images are large… Various compression schemes created to control

and counteract file size problems… Compression techniques distinguished by

whether they remove detail from the image… Lossless… compress image data without

removing detail Lossy compress image data by removing detail..

Different compression schemes… RLE Run Length Encoding… Lossless compression supported by tiff and

a few other common windows file formats… LZW Lemple Ziff Welch… Lossless compression supported by

TIFF,PDF,Gif89a and postscript file formats…

Different compression schemes… Jpeg… Joint phographic experts group… Lossy compression supported by PDF and

Jpg and postscript file formats… CCITT lossless compression for black and

white images… supported by PDF and postscript language file formats…