Week 3

TIFF- tag image file format- developed by Aldus Corporation in 1986, saving images from scanners, frame grabbers, paint/photo retouching programs
Today- most versatile, reliable and widely supported bit-mapped format/ it is capable of describing bi-level, greyscale, palette-colour, full-colour image data in several colour spaces.

PICT file= this format-not an acronym- native to macitosh. It first appeared in 1984 with introduction of MacDraw software, great for presentations, screen displays and video work.
Can contain bit-mapped and object-oriented graphics

BMH file= standard windows bitmap image format on DOS and windows-compatible computers. When saving an image in this format, you can specify either Microsoft windows or OS/2 format.

EPS file= encapsulated postscript- files are the standard format for storing high resolution postscript illustrations. EPS format- introduced in mid 1980’s allows both mac and windows users to save bit-mapped screen representations of screen images.

GIF file- graphics interchange format- files define a protocol intended for the on-line transmission and interchange of raster graphic data in a way that is dependent of the hardware used in their creation or display
Developed in 1987 by compuserve- one of the worlds most successful bulletin borad services- for compressing 8 bit images that could be telecommunicated through their services and exchanged among users.

JPEG file= standard image compression mechanism. Name derived from the Joint Photographic Experts Group, the original name of the committee that wrote the standard. Not a file format, but a method of data encoding used to produce the size of a data file commonly used within file formats such as JTIF & TIFF.

(JFIF)JPEG file interchange format, minimal file, enables JPEG bit streams to be exchanged between a wide variety of platforms and applications
Jpeg designed for compressing either full-colour or greyscale images of natural, real world scenes. It discards data- referred to as lossy


JPEG2000- wavelet based image compression standard. Created in 2000 by joint photographic experts group committee.

PNG file- developed as an alternative to GIF- used for the net like GIF. It preserves all colour info and alpha channels in an image and used lossless compression to reduce size.

PDF adobe acrobat electronic publishing software for Mac, windows, Unix and DOS.

PSD- Photoshop files- a file saved in this can only be opened and edited in Photoshop. User has option to save the file in a variety of other formats.

Visible portion of the electromagnetic spectrum extends from about 400nm (violet green) to about 700nm (red light) with our eyes having peak sensitive at about 550nm (green light)
Additive colours.
Primary colours- red, green, blue
Subtractive primaries are pigments which create a spectrum of colours in different combinations. Unlike monitors, printers use subtractive primaries to produce colour. Cyan, magenta, yellow, black= cmyk.