HW047
Math 2984 - Fall 2017
Intro to Mathematical Problem Solving

TASK: Read a PNG file containing a grayscale image of Saturn, change to white all the pixels in a wide strip along the border of the image, and save the modified image to a JPG file.

COMMENT: In class, we have discussed:

• how MATLAB can read a grayscale graphics file, storing the information as a matrix of integers between 0 and 255;
• how to reset entries of a matrix, setting just one entry, or a column or row, or a submatrix;
• how the color "white" is represented numerically in a grayscale image;
• how to save a matrix of graphics information as a graphics file.

INSTRUCTIONS: Copy the file 'saturn.png' from the Canvas homework site.

        I = (read the file into MATLAB)
        view the image I
        ? = (get m and n, the number of rows and columns in I)
        I2 = I;  (make a copy to modify)
        ? = ? (set columns 1 to 20 of I2 to white)
        ? = ? (set the last 20 columns of I2 to white)
        ? = ? (set rows 1 to 20 of I2 to white)
        ? = ? (set the last 20 rows of I2 to white)
        view the image I2
        save I2 to 'saturn_framed.jpg'
      

CHECK: You should get something like this:

SUBMIT: Your script file should be named "hw047.m", and begin with:

        % hw047.m
        % YOUR NAME
        % This script (describe what it does)