Gateway
Computer program for transferring (and reformatting) data between incompatible applications or networks.

Galleys
In traditional publishing, the type set in long columns, not laid out on a page. In desktop publishing, galleys can be printed out using a page-assembly program, for proofreading and copy fitting purposes.

GIF (Graphic Interchange Format)
GIF images have very small sizes. It displays 256 colors. GIF is the most widely used graphic format on the web.

Glow
Surround an image by soft or bright highlighting.

Gradient
Gradual transition of colors is called gradient. Gradients create dept and special effects like metal etc.
In the two images, the scalar field is in black and white, black representing higher values, and its corresponding gradient is represented by blue arrows.

Graphic Backgrounds
Bottom-most layer on a web page, usually with either a design or color that highlights the above copy. A small graphic can be tiled to create a background texture for a web page.

Graphic Design
Art of communicating a message, idea or concept visually through text, images and various designs. The term is used as a collective name for all activities relating to visual design, including web design, logo design etc.

Greeked Text
In page-assembly programs, text that appears as gray bars approximating the lines of type rather than actual characters. This speeds up the amount of time it takes to draw images on the screen.

Greyscale
Color mode in which Black and White colors and in combination. Grey Scale, as the words tells us, has various shades of Grey, Black and White.

GUI (Graphical User Interface)
This is a user interface based on graphics (icons and pictures and menus) instead of text. When designing a website, it is important to design the GUI effectively.

Gutter
In double-sided documents, the combination of the inside margins of facing pages; the gutter should be wide enough to accommodate binding.