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Unit 1: Fundamentals of Computer Graphics

One important application of lookup table is in animation.
Lookup tables are used in animation displaying short sequence of images that
are repetitive.

1.6 Summary

• Creation, representation, and management of images on the computer screen come under the
computer graphics which is a field of computer science.
• An image is a minute rectangular box or a grid of pixels.
• An image file refers to any pictorial representation which is stored in the computer memory.

• Image processing is a method used to develop or enhance raw images.
• Designs with reference to appliances, computers, machines, and gadgets are called as User
interface design.
• Image representation is nothing, but the depiction of images in clear and comprehensible manner.

• Direct coding helps us to allocate a specific amount of storage space for each pixel, in order to code
its color.
• Lookup table is the mechanism used for converting a variety of colors into another variety of
colors.
1.7 Keywords
GIF: Graphic Interchange Format.
JPG/JPEG: Joint Photographic Experts Group.
TIFF: Tagged Image File Format.

Unwieldy: Difficult to carry or manage because of size, shape, weight, or complexity.
1.8 Self Assessment
1. State whether the following statements are true or false:

(a) The main function of an image data format is that it specifies the order, in which, the pixel
values are stored in the image data section.
(b) Image enhancing is the action or process of converting the images to digital images.
(c) A pointer is a device which enables you to select objects on the display screen.
(d) A contour representation helps in easy recovery of the full image in bitmap form.

(e) The ratio or the proportion of an image’s width to its height, measured in unit length or
number of pixels, is referred to as aspect ratio.
2. Fill in the blanks:
(a) The file header’s length is often ………………..
(b) ……………………….. is a process intended to enhance the visual appearance of an image.

(c) ……………… offer an easy means of modification and data entry.
(d) An image’s individual pixels can be indicated by their…………………...
(e) The lookup table size relies on the number of colors that the ………………… system can
display simultaneously.

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