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Learn how to implement a space-wise linear color-modification algorithm.

Revised: Sat Apr 02 16:43:04 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

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 Prob03.jpg along with a written specification of a space-wise linear image modification algorithm.

Implement the algorithm

The primary purpose of the test is to determine if the student can implement the algorithm and also satisfy some requirements for text output on the commandline 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 specified 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.

The algorithm

Scale the blue and green color components by a scale factor that is less than or equal to 1.0. The green scale factor:

  • Is equal to 1.0 on the left side of the image
  • Is equal to 0.0 on the right side of the image
  • Decreases linearly with distance going from left to right across the image.

The blue scale factor

  • Is 0.0 on the left side of the image
  • Is 1.0 on the right side of the image
  • Increases linearly with distance going from left to right across the image.

Do not scale the red color component.

The program output

The program produces the images shown in Figure 1 and Figure 2 and produces the output text shown in Figure 3 on the command line screen.

Figure 1 - The raw image.

Questions & Answers

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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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