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Thread: java help

  1. #1
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    Default java help

    I need help with this plz

    Old-fashioned photographs from the 19th century are not quite black and white and not quite color, but seem to have shades of gray, brown, and blue. This effect is called sepia. Define and test a function named sepia that converts a color image to sepia. This function first calls the grayscale function to convert the color image to grayscale. Here is a code segment for then transforming the color component value of a single pixel to achieve a sepia effect. Note that the value for green does not change.


    import images.APImage;
    import images.Pixel;
    import java.util.Scanner;
     
    public class jm54{
     
       public static void main(String[]args){
          Scanner reader = new Scanner(System.in);
          APImage image = new APImage("smokey.jpg");
          image.draw();
          for (Pixel p: image){
             int red = p.getRed();
             int green = p.getGreen();
             int blue = p.getBlue();
             int average = (red + green + blue) / 3;
                p.setRed (average);
                p.setGreen(average);
                p.setBlue(average);  
                if (red < 63){
                    red = (int)(red * 1.1);
                    blue = (int)(blue * 0.9);
                 }else if (red < 192){
                	 red = (int)(red * 1.15);
                	 blue = (int)(blue * 0.85);
                 }else{
                	red = Math.min(int(red * 1.08), 255);
                			blue = (int)(blue * 0.93);
             }       
          }
         // System.out.print("Press return to continue:");
         // reader.nextLine();
          image.draw();
       }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: java help

    Please explain your problems.

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: java help

    ok i manage to set the image to gray scale but i don't know how to convert it to sepia tone

  4. #4
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    Default Re: java help

    What is the algorithm for converting pixel colors to sepia ?
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: java help

    int width = theoriginal.getWidth();
    int height = the original.gethieght(0
    APImage theClone = new APImage(width,height);
    for (int y = 0; y , height; y++0
    for (int x = 0;  x< width; x++){
    Pixel pixelInOriginal = theoriginal.getPixel(x, y);
    Pixel pixelInClone = theClone.getPixel(x, y);
    pixelInClone.setRed(pixelInOriginal.getRed());
    pixelInClone.setGreen(pixelInOriginal.getGreen());
    pixelInClone.setBlue(pixelInOriginal.getBlue());


    i think is this im sorry im really having trouble in this course i really dont understand this but im trying but its hard

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: java help

    Have you put that code in the program that you are working on? What happened?

    There are missing {}s following the for statements. {}s are needed to show the logic of the code.
    Code inside {}s should be indented 3-4 spaces to show nesting logic.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: java help

    ok the image turns gray but when at the end when i put this in it gives me an error

    red = Math.min(int(red * 1.08),255);

    ok i got the image to to stay gray but in the project description it gives me tells me to make image grayscale i got that part but im lost with the sepia part here description again:






    Old-fashioned photographs from the 19th century are not quite black and white and not quite color, but seem to have shades of gray, brown, and blue. This effect is called sepia. Define and test a function named sepia that converts a color image to sepia. This function first calls the grayscale function to convert the color image to grayscale. Here is a code segment for then transforming the color component value of a single pixel to achieve a sepia effect. Note that the value for green does not change.

    if (red < 63){
    red = (int)(red * 1.1);
    blue = (int)(blue * 0.9);
    }else if (red < 192){
    red = (int)(red * 1.15);
    blue = (int)(blue * 0.85);
    }else{
    red = Math.min(int(red * 1.08), 255);
    blue = (int)(blue * 0.93);
    }

  8. #8
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    Default Re: java help

    it gives me an error
    If you want help with the error, copy the full text of the error message and paste it here.
    If you don't understand my answer, don't ignore it, ask a question.