Graphics
Typed 95.10/19

©Kevin Jaques 1995

Bit Depth= 2^depth  colours
Eg. 8 bits = 2^8 = 256 colours

Loss Less Compression
Sequel pixels with same value stored encoded

Lossy Compression
down to 10% size. Deliberately loses info which canąt be seen/printed. Donąt use on files where any loss would corrupt

Vector Fmt
describes shapes mathematically

Raster Fmt
describes as pixel patterns

bit map = black & white sub-classes though often used as synonym 
not easy to translate to vector language - eg. postscript
not tied to resolution
easy to translate to raster
can embed raster - not vice versa

Tiff
best flexibility
picture - default Mac

Photoshop 
 Adobe format
most DTP canąt import

GIF
2d best compression
canąt separate colors (max 256)

JPEG
developed by J + Photographic Experts Group so should be international standard soon
lossy compressions

JFIF - TIFF
embedding JPEG

TGA - (Targa)
common video
several variations
supports multi compression types
used for AT & T True vision

PCX
raster originating on PC

BMP
available in most Windows applications, especially application development

WMF
Windows Meta File
list of calls to Windows graphics drawing lib
difficult to display unless originating program running

CGM
Computer Graphics Meta File
very flexible vector format
few applications offer full features

Auto Cad DXF
ASCII encoded
Very large

GL/2
HP plotter language

EPS
generally contains a raster graphic as a preview (Mac uses PICT &PC uses TIFF)
only format to support transparent white in Bit Map Mode

DeBabelizer
format conversions
415-332-4343

This łGraphics Formats˛  was delivered by:

			Kevin Jaques, B.A. LL.B.
										of the
							Jaques Law Office

#101 - 2515 Victoria Avenue			Fax: 525­4173
Regina, Saskatchewan									Home: 586­2234
email: jaques.law@dlcwest.com		Tel: 359­3041