INTRODUCTION

Objectives

• Be able to describe a digital image and the pixels from which it's made
• Explain how the number of pixels in an image affects its size
• Explain why enlarging an image past a certain point reveals the pixels from which it's made

Introduction

Digital cameras and traditional cameras are very much alike in many respects. The biggest difference is the way images are captured. With traditional films, they are caprutured on silver-based film. With digital cameras, they are captured on solid-state devices called image sensors. In this chapter we take a look at the digital photograph and the image sensor used to capture it.

1.1 WHAT IS A DIGITAL PHOTOGRAPH?

1.2 DIGITAL FILM—THE IMAGE SENSOR

1.3 CAPTURING AN IMAGE

1.4 CCD AND CMOS IMAGE SENSORS

1.5 AREA ARRAY AND LINEAR IMAGE SENSORS

1.6 IMAGE SIZES

1.7 IMAGE COLOR

1.8 IMAGE FILE SIZES

1.9 IMAGE ARITHMATIC