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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

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
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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
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
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it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
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what is biological synthesis of nanoparticles
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how did you get the value of 2000N.What calculations are needed to arrive at it
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