.jpg [photographic content]

.gif [graphics - supports transparency & animation]

.png [most newer versions of browsers should support it - but older OS/browser browser combinations may not - supports transparency & animation]

.psd [photoshop editable file with layers, etc.]

.pdf [portable document format - maintains document formatting]

.tif [tagged image file]

.eps [encapsulated postscript]

72 dpi [dots/points/pixels per inch]

[*computer screen resolution is typically 72dpi]

Screen size of graphic at 100% zoom is actual size - both are 72dpi [1:1].

[*Remember our 'target' screen size is 1280x960 pixels, not the higher resolution screen of your workstation]

Screen size depends on resolution, prepared print size & 'zoom' level.

[In Photoshop, use 'view/actual pixels' & 'view/print size' plus 'image/image-size' dialogue to determine scale & resolution]

RGB [Red, Green, Blue; 0-255]

CMYK [Cyan, Yellow, Magenta, Black] or RGB