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Learn how to invert images and how to display images in Ericson's PictureExplorer object.

Revised: Sat Apr 02 15:08:04 CDT 2016

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Table of contents

Preface

This module is one of a series of modules designed to teach you about Object-Oriented Programming (OOP) using Java.

The program described in this module requires the use of the Guzdial-Ericson multimedia class library. You will find download, installation, and usageinstructions for the library at Java OOP: The Guzdial-Ericson Multimedia Class Library .

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the Figures and Listings while you are reading about them.

Figures

  • Figure 1 . The raw image.
  • Figure 2 . The modified image.
  • Figure 3 . Output text on the command line screen.
  • Figure 4 . javadocs description of the explore method.
  • Figure 5 . javadocs description of the getPixels method.
  • Figure 6 . javadocs description of the Pixel class.

Listings

Preview

The program that I will explain in this module is designed to be used as a test of the student's understanding of programming using Java andEricson's media library.

The student is provided an image file named Prob02.jpg along with a pair of PictureExplorer windows containing the raw image and a modified version of the image. (See Figure 1 and Figure 2 .)

Deduce the algorithm

The first part of the test is to determine if the student can examine the raw image shown in the PictureExplorer window in Figure 1 and deduce the algorithm required to produce the output shown in the PictureExplorer window in Figure 2 .

Implement the algorithm

The second part of the test is to determine if the student can implement the algorithm once it is established and also satisfy some requirements for textoutput on the command line screen. Among other things, this requires that the student be able to:

  • Create a Picture object from an image file.
  • Write an accessor method to return a reference to the Picture object.
  • Modify the pixels in the picture according to the algorithm.
  • Display the raw picture and the modified picture in PictureExplorer objects by calling the explore method on the Picture object before and after it is modified.

Program output

The raw image is displayed in the PictureExplorer window shown in Figure 1 .

Figure 1. The raw image .
Image of a penguin in the snow in front of some houses.

The modified image is shown in the PictureExplorer window in Figure 2 .

Figure 2. The modified image .
Image of a penguin with the colors modified according to the algorithm developed in this module.

The required output on the command-line screen is shown by the last two lines of text in Figure 3 . The other text in Figure 3 was produced by the system during the compilation and execution process.

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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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