Working PGM reader
Working image display
Basic constructor for PGMImage
Write javadoc
Histogrammes
Write javadoc for histograms
Fix english mistakes
Threshold function
store transformed image
Add a method to scale images
Add buttons to scale the images
Fix bug: allocated array not large enough
Fix bug in downscaling
Add a method to scale images by giving a new width and a new height
Code formatting
Add a method for computing the difference between two images
Correct buttons layout
GUI for difference
Add an (untested) method to save an image to a file
Add export button