Resize fails in Check50 but 1x1 pixel images work. I've compared the outcome with the staff implementation and it's the same.
[removed code per academic honesty guidelines]
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Padding should be
0x00. You are writing
0xff in your copied rows.
To find this, you should resize an image using the staff version and then with your version, and then run
diff on the 2 files. For this pset, testing "visually" will never pick up many of the issues. Use
diff as explained in the pset.