Disk bugfixes

[bdrechsler]

Commented out the subpixeling for now.
Fixed issue with physical pixel size.
Fixed vertical bars in images by rounding to the nearest integer.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (6294acc) to head (9aea699).
⚠️ Report is 27 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   88.82%   90.13%   +1.30%     
==========================================
  Files          11       11              
  Lines        2220     2362     +142     
==========================================
+ Hits         1972     2129     +157     
+ Misses        248      233      -15     

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[psheehan]

Overall looks good and tests are passing! I think my only note is that I would be inclined to not turn off the sub-pixeling. I think #10 should fix it and since that is imminent, we might as well just confirm and merge.