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Listing 6 computes new values for the red and green components based on the existing color values for the pixel and the scalefactors computed in Listing 5 .

Listing 6 . Apply the scale factors.
pixel.setGreen((int)(green * greenScale)); pixel.setBlue((int)(blue * blueScale));}//end for loop

Then Listing 6 calls the setGreen and setBlue methods on the Pixel object to set the green and blue color values to the newly computed values.

The end of the for loop

Listing 6 also signals the end of the for loop that began in Listing 4 .

Display the modified image

Finally, Listing 7 calls the explore method again to display the image shown in Figure 2 .

Listing 7 . Display the modified image.
pic.explore(); }//end run method}//end class Prob03Runner

The end of the run method

Listing 7 also signals the end of the run method and the end of the Prob03Runner class.

Return control to main

The run method terminates and returns control to the main method shown in Listing 1 .

The code in the main method calls a getter method to get a reference to the Picture object.

The reference is passed to the println method, which displays the information about the Picture object in the last line of Figure 3 .

The program terminates

Then the main method terminates, at which time the program terminates and returns control to the operating system.

Run the program

I encourage you to copy the code from Listing 8 , compile it and execute it. Experiment with the code, making changes, andobserving the results of your changes. Make certain that you can explain why your changes behave as they do.

You can download a copy of the required input image file here .

Summary

In this module, I showed you how to implement an algorithm that causes the green and blue color values in an image to change in a linear fashion going fromleft to right across the image.

What's next?

You will learn more about abstract methods, abstract classes, and overridden methods in the next lesson. Very importantly, you will learn more about overriding the toString method.

While not a requirement of the course, you can select the following links to view optional online video lectures on the material in thismodule.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Implementing a space-wise linear color-modification algorithm
  • File: Java3006.htm
  • Published: 07/30/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

Complete program listing

A complete listing of the program discussed in this module is shown in Listing 8 below.

Listing 8 . Complete program listing.
/*File Prob03 Copyright 2008 R.G.Baldwin *********************************************************/public class Prob03{ public static void main(String[]args){ Prob03Runner obj = new Prob03Runner();obj.run(); System.out.println(obj.getPicture());}//end main }//end class Prob03//======================================================// class Prob03Runner{//Instantiate the Picture object. private Picture pic = new Picture("Prob03.jpg");public Prob03Runner(){//constructor System.out.println("Dick Baldwin");}//end constructor //----------------------------------------------------////Accessor method public Picture getPicture(){return pic;}//----------------------------------------------------// //This method is where the action is.public void run(){ pic.addMessage("Dick Baldwin",10,20);//Display a PictureExplorer object. pic.explore();//Get an array of Pixel objects. Pixel[]pixels = pic.getPixels(); //Declare working variablesPixel pixel = null; int green = 0;int blue = 0; int width = pic.getWidth();double greenScale = 0; double blueScale = 0;//Scale the blue and green color components according // to the algorithm given above.//Do not scale the red component. for(int cnt = 0;cnt<pixels.length;cnt++){ //Get blue and green values for current pixel.pixel = pixels[cnt];green = pixel.getGreen(); blue = pixel.getBlue();//Compute the column number and use it to compute // the scale factor.int col = cnt%width; greenScale = (double)(width - col)/width;blueScale = (double)(col)/width; //Apply the scale factor.pixel.setGreen((int)(green * greenScale)); pixel.setBlue((int)(blue * blueScale));}//end for loop //Display a PictureExplorer object.pic.explore(); }//end run method}//end class Prob03Runner

-end-

Questions & Answers

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
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