fix: fix rgb MDA

[tlambert03]

fixes #346

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.25%. Comparing base (13758ba) to head (a48fed1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
+ Coverage   78.14%   78.25%   +0.10%     
==========================================
  Files          13       13              
  Lines         627      630       +3     
==========================================
+ Hits          490      493       +3     
  Misses        137      137              

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