get file format

[Rdornier]

Add a method to get the image file format

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.67%. Comparing base (731293d) to head (5163833).
Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #80      +/-   ##
============================================
+ Coverage     95.49%   95.67%   +0.18%     
- Complexity     1210     1252      +42     
============================================
  Files            46       46              
  Lines          3238     3377     +139     
  Branches        260      271      +11     
============================================
+ Hits           3092     3231     +139     
  Misses           85       85              
  Partials         61       61              

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