Implement the algorithm (cont'd)

Among other things, this requires that the student be able to:

• Create a Picture object from an image file.
• Write an accessor method to return a reference to the Picture object.
• Modify the pixels in the picture according to the specified algorithm.
• Display the raw picture and the modified picture in PictureExplorer objects
  • by calling the explore method on the Picture object
  • before and after it is modified.