Dale - Computer Science Illuminated 103

Dale - Computer Science Illuminated 103 - picture is called...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Pixels Individual dots used to represent a picture; stands for picture elements Resolution The number of pixels used to represent a picture Raster-graphics format Storing image informa- tion pixel by pixel 76 Chapter 3 Data Representation Figure 3.12 A digitized picture composed of many individual pixels Courtesy of Amy Rose Figure 3.11 The Netscape color palette Digitized Images and Graphics A photograph is an analog representation of an image. It is continuous across its surface, with shades of one color blending into another. Digi- tizing a picture is the act of representing it as a collection of individual dots called pixels , a term that stands for picture elements. Each pixel is composed of a single color. The number of pixels used to represent a
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: picture is called the resolution . If enough pixels are used (high resolution), and are then presented in the proper order side by side, the human eye can be fooled into thinking its viewing a continuous picture. Figure 3.12 shows a digitized picture, with a small portion of it magni-fied to show the individual pixels. The storage of image information on a pixel-by-pixel basis is called a raster-graphics format . There are several popular raster file formats in use, including bitmap (BMP), GIF, and JPEG. A bitmap file is one of the most straightforward graphic representa-tions. In addition to a few administrative details, a bitmap file contains the...
View Full Document

This note was uploaded on 01/13/2011 for the course CSE 1550 taught by Professor Marianakant during the Fall '10 term at York University.

Ask a homework question - tutors are online