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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
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.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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