In computer graphics, a color look-up table, or CLUT, is the set of available colors for a given application.
For example, a 24-bit system can display 16 million unique colors, but a given program would use only 256 of them at a time if the display is in 256-color mode. The CLUT in this case would consist of the 16 million colors, but the program’s palette would contain only the 256-color subset. To avoid dithering (i.e., varying the pattern of dots in an image) on 8-bit machines, you should only use colors from a predesignated CLUT.
CMYK stands for cyan magenta yellow and blacK and is a color system used in the offset printing of full-color documents.
Offset uses cyan, magenta, yellow, and black inks and is often referred to as “four-color” printing. Monitors use red, green, and blue light instead, so they display images using a different color system called RGB. One of the great problems of the digital age has been matching colors between these two systems; i.e., taking a digital RGB image and making it look the same in print using CMYK. These problems are addressed by applications such as the Pantone Matching System.
To crop means to cut the pieces of an image that you don’t need.
Cropping differs from resizing because when you crop an image you retain the dimensions of the image. Resizing an image actually shrinks the image into smaller dimensions.
CSS, or cascading stylesheets, allow you to define how web page elements are displayed.
Specific margins or colors can be associated with elements on the web page; Headers and links, for example. When style sheets are applied to a new page, the elements are changed according to the specifications of the style.
To fill an image means to paint the inside of it with a selected color or pattern.
The fill can be used to create shading and other simple effects. In HTML, a popular technique is to fill tables with colors, especially in long lists of information. For example, if you are making a web page showing the 50 top-grossing movies of the year, it will be easier to read if you fill the rows of the table and alternate the background colors.