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This module contains review questions and answers keyed to the module titled Java3018: Darkening, Brightening, and Tinting the Colors in a Picture.

Revised: Sun Apr 03 17:16:35 CDT 2016

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This module contains review questions and answers keyed to the module titled Java3018: Darkening, Brightening, and Tinting the Colors in a Picture .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.


Question 1 .

Given Figure 1 , Figure 2 , and Figure 3 , which of the following output images is produced by the code in Listing 1 ?

A. Figure 4

B. Figure 5

Listing 1 . Question 1.
/*File Java3018ra Copyright 2013 R.G.Baldwin *********************************************************/import java.awt.Color; public class Java3018ra{public static void main(String[] args){new Java3018raRunner().run(); }//end main}//end class Java3018ra //======================================================//class Java3018raRunner{ public Java3018raRunner(){//constructorSystem.out.println("Display your name here."); }//end constructor//----------------------------------------------------// public void run(){Picture skater = crop(new Picture("Prob04a.bmp"),6,59,392,293); Picture hole = crop(new Picture("Prob04b.bmp"),6,59,392,293);Picture snowScene = crop(new Picture("Prob04c.jpg"),6,59,392,293); processBackground(hole,snowScene);redTint(skater); greenScreenDraw(skater,snowScene,0,0);snowScene.explore(); }//end run method//----------------------------------------------------// 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//----------------------------------------------------// private void processBackground(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();int avg = (int)(color.getRed()*0.299+ color.getGreen()*0.587+color.getBlue()*0.114); destPixels[cnt].setColor(new Color(avg,avg,avg)); }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 processBackground//----------------------------------------------------// 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 //----------------------------------------------------//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 Java3018raRunner

Figure 1 - Prob04a.bmp.

Image of a female ice skater on a green background.

Figure 2 - Prob04b.bmp.

Image of a black ellipse on a green background.

Figure 3 - Prob04c.jpg.

Image of a frozen lake with houses on the far side.

Figure 4 - Possible output image.

Image of a red-tinted ice skater standing on a pink ellipse with a gray scale background of a frozen lake.

Figure 5 - Possible output image.

Image of a red-tinted ice skater standing on a pink ellipse with a darkened background of a frozen lake.

Answer 1



What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Spacer image of a rabbit and a penguin.

This image was also inserted for the purpose of inserting space between the questions and the answers.

Spacer image of a penguin in the snow in front of some houses.


Answer 1

The code in Listing 1 produces the output image shown in Figure 4 .

Back to Question 1


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3018r Review
  • File: Java3018r.htm
  • Published: 02/17/13

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


Questions & Answers

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.
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
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