Đang chuẩn bị liên kết để tải về tài liệu:
Lecture Introduction to Computers: Chapter 8B - Peter Norton's

Chapter 8B - Graphics and multimedia. This chapter define the terms bitmap and vector and differentiate these file types, list some of the most commonly used file formats for bitmap and vector Images, identify four ways to load graphic files into a computer, list five types of graphics software and their uses, define the terms multimedia and interactivity. | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 8B Graphics and Multimedia Graphic File Formats Bitmapped images Most common image type Also called raster images Image is drawn using a pixel grid Each grid contains a color Color depth Number of usable colors Used to store drawings or photographs Resizing image can reduce quality 8B- Teaching tip Describe bitmapped image as drawing on graph paper. Fill in the blocks to create the image. I use a graph paper circle to illustrate. Bitmap Resized This image was drawn as a straight line. 8B- Graphic File Formats Vector images Drawn using mathematical formulas Formulas describe the line properties CAD and animation software Resizing image will not reduce quality 8B- Teaching tip Remind your students of the algebra classes they took in high school. The functions they plotted on the Cartesian plane are similar to vector equations. Graphic File Formats File formats and compatibility Method for storing an image Each method has pros and cons Some formats are proprietary Graphic software can handle all formats 8B- Teaching tip Table 8B.1 on page 325 lists several image types. Graphic File Formats Common bitmapped file formats BMP EMF GIF JPG PICT PNG TIFF 8B- Discussion point Discuss when JPGs are appropriate. A picture of my daughter will lose some detail in her shirt. This is OK. However, a JPG of my most recent CAT scan may lose detail of a tumor. This is not OK. Graphic File Formats Vector file formats Most vector formats are proprietary Two universal formats exist DXF IGES 8B- Acquiring Images Scanners Like a photocopier Image is saved onto disk Scanners import a variety of formats 8B- Acquiring Images Digital cameras Stores digitized images Uses long term storage Image is usually a JPG file 8B- Acquiring Images Digital video cameras Stores full motion video Uses long term storage Movie can be transferred to DVD 8B- . | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 8B Graphics and Multimedia Graphic File Formats Bitmapped images Most common image type Also called raster images Image is drawn using a pixel grid Each grid contains a color Color depth Number of usable colors Used to store drawings or photographs Resizing image can reduce quality 8B- Teaching tip Describe bitmapped image as drawing on graph paper. Fill in the blocks to create the image. I use a graph paper circle to illustrate. Bitmap Resized This image was drawn as a straight line. 8B- Graphic File Formats Vector images Drawn using mathematical formulas Formulas describe the line properties CAD and animation software Resizing image will not reduce quality 8B- Teaching tip Remind your students of the algebra classes they took in high school. The functions they plotted on the Cartesian plane are similar to vector equations. Graphic File Formats File formats .