3.19 Java3018: darkening, brightening, and tinting the colors in

Revised: Sun Apr 03 14:24:32 CDT 2016

This page is included in the following Books:

• ITSE 2321 - Object-Oriented Programming (Java)
• Object-Oriented Programming (OOP) with Java

Table of contents

• Preface
  • Viewing tip
    • Figures
    • Listings
• Preview
• General background information
• Discussion and sample code
• Run the program
• Summary
• What's next?
• Online video links
• Miscellaneous
• Complete program listing

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 . Input file Prob04a.bmp.
• Figure 2 . Input file Prob04b.bmp.
• Figure 3 . Input file Prob04c.jpg.
• Figure 4 . Required output image.
• Figure 5 . Required text output.
• Figure 6 . Cropped version of the snow scene image.
• Figure 7 . The skater with a red tint applied.

Listings

• Listing 1 . The driver class named Prob04.
• Listing 2 . Beginning of the class named Prob04Runne.
• Listing 3 . Beginning of the run method.
• Listing 4 . Darken the background of the snow scene.
• Listing 5 . Beginning of the darkenBackground method.
• Listing 6 . Beginning of the processing loop.
• Listing 7 . The else clause in the processing loop.
• Listing 8 . Apply a red tint to the skater.
• Listing 9 . The remainder of the run method.
• Listing 10 . Complete program listing.

Preview

In this module, you will learn how to darken, brighten, and tint the colors in a Picture object.

Program specifications

Write a program named Prob04 that uses the class definition shown in Listing 1 and Ericson's media library along with the image files in the following list to produce the four graphic output imagesshown in Figure 1 through Figure 4 .

• Prob04a.bmp
• Prob04b.bmp
• Prob04c.jpg

Figure 1 - Input file Prob04a.bmp.

Figure 2 - Input file Prob04b.bmp.

Figure 3 - Input file Prob04c.jpg.

Figure 4 - Required output image.

New classes

You may define new classes as necessary to cause your program to behave as required, but you may not modify the class definition for the class named Prob04 shown in Listing 1 .

Required text output

In addition to the four output images mentioned above, your program must display your name and the other line of text shown in Figure 5 on the command-line screen.

General background information

This program uses a black ellipse on a green background (see Figure 2 ) as a pattern to cause the pixels in a snow scene (see Figure 3 ) at the location of the ellipse to be given a red tint and causes all other pixels inthe snow scene to be darkened (see Figure 4 ) .