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

What's next?

You will probably learn more than you already know about interfaces, arrays of type Object, etc., in the next module.

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


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Darkening, Brightening, and Tinting the Colors in a Picture
  • File: Java3018.htm
  • Published: 08/01/12

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. I neither receive compensation for those sales nor do I know who doesreceive compensation. If you purchase such a book, please be aware that it is a copy of a module that is freelyavailable on cnx.org and that it was made and published without my 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 10 below.

Listing 10 . Complete program listing.
/*File Prob04 Copyright 2008 R.G.Baldwin *********************************************************/import java.awt.Color; public class Prob04{public static void main(String[] args){Prob04Runner obj = new Prob04Runner(); obj.run();}//end main }//end class Prob04//======================================================// class Prob04Runner{public Prob04Runner(){//constructor System.out.println("Display your name here.");}//end constructor //----------------------------------------------------//public void run(){ Picture skater = new Picture("Prob04a.bmp");skater.explore(); skater = crop(skater,6,59,392,293);Picture hole = new Picture("Prob04b.bmp"); hole.explore();hole = crop(hole,6,59,392,293); Picture snowScene = new Picture("Prob04c.jpg");snowScene.explore(); snowScene = crop(snowScene,6,59,392,293);//Make all the pixels darker in the snow scene except // for those in the location of the hole. Make them// brighter. darkenBackground(hole,snowScene);//Apply a red tint to the skater redTint(skater);//Draw the skater on the snowScene. greenScreenDraw(skater,snowScene,0,0);//Display students name on the final output and // display it.snowScene.addMessage("Display your name here.",10,15); snowScene.explore();System.out.println(snowScene); }//end run method//----------------------------------------------------// //Assumes the source has a pure green background.// Applies a red tint to every pixel that is not pure // green.private void redTint(Picture pic){ Pixel[]pixels = pic.getPixels(); Color color = null;int red = 0; int green = 0;int blue = 0; for(int cnt = 0;cnt<pixels.length;cnt++){ color = pixels[cnt].getColor(); //Apply a red tint to all non-green pixelsif(!(color.equals(Color.GREEN))){ //Increase the value of the red componentred = color.getRed(); if(red*1.25<255){ red = (int)(red * 1.25);}else{ red = 255;}//end else //Decrease the value of blue and greengreen = (int)(color.getGreen()*0.8); blue = (int)(color.getBlue()*0.8);//Apply the new color to the pixel. pixels[cnt].setColor(new Color(red,green,blue)); }//end if}//end for loop }//end redTint//----------------------------------------------------// //Assumes the pattern image has a pure green background.// Assumes that the pattern and the destination have the // same dimensions. Darkens every pixel in the// destination that is at the location of a green pixel // in the pattern. Applies a red tint to every pixel// in the destination that is at the location of a // non-green pixel in the patternprivate void darkenBackground( Picture pattern,Picture dest){ Pixel[]patternPixels = pattern.getPixels(); Pixel[]destPixels = dest.getPixels(); Color color = null;int red = 0; int green = 0;int blue = 0; for(int cnt = 0;cnt<patternPixels.length;cnt++){ color = patternPixels[cnt].getColor(); if(color.equals(Color.GREEN)){//Darken corresponding pixel in the destination. color = destPixels[cnt].getColor(); destPixels[cnt].setColor(color.darker()); }else{//Apply a red tint to the corresponding pixel in // the destination.color = destPixels[cnt].getColor();red = color.getRed(); if(red*1.25<255){ red = (int)(red * 1.25);}else{ red = 255;}//end else green = (int)(color.getGreen() * 0.8);blue = (int)(color.getBlue() * 0.8); destPixels[cnt].setColor(new Color(red,green,blue)); }//end else}//end for loop }//end darkenBackground//----------------------------------------------------// //Assumes a source image with a pure green background.// Copies all non-green pixels from the source image to // the destination image at the location explained// below. Note that JPEG images typically won't have // a pure green background even if they had a pure// green background before being compressed into the // JPEG format. BMP images work well for this.private void greenScreenDraw( Picture source,Picture dest, //Place the upper-left corner// of the source image at the // following location in the// destination image. int destX,int destY){ int width = source.getWidth();int height = source.getHeight(); Pixel pixel = null;Color color = null; for(int row = 0;row<height;row++){ for(int col = 0;col<width;col++){ color = source.getPixel(col,row).getColor();if(!(color.equals(Color.GREEN))){ pixel = dest.getPixel(destX + col,destY + row);pixel.setColor(color); }//end if}//end inner loop }//end outer loop}//end greenScreenDraw //----------------------------------------------------////Crops a Picture object to the given width and height // with the upper-left corner located at startCol and// startRow. private Picture crop(Picture pic,int startCol,int startRow, int width,int height){ Picture output = new Picture(width,height);int colOut = 0; int rowOut = 0;int col = 0; int row = 0;Pixel pixel = null; Color color = null;for(col = startCol;col<startCol+width;col++){ for(row = startRow;row<startRow+height;row++){ color = pic.getPixel(col,row).getColor();pixel = output.getPixel(colOut,rowOut); pixel.setColor(color);rowOut++; }//end inner looprowOut = 0; colOut++;}//end outer loop return output;}//end crop }//end class Prob04Runner


Questions & Answers

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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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