OK, thanks! When pull request Add `ComputeIndex()` member function to ImageConstIterator by N-Dekker · Pull Request #5787 · InsightSoftwareConsortium/ITK · GitHub is accepted, I can make a follow-up PR to make ImageConstIterator::GetIndex() “future legacy remove”, which can then hopefully still be included with the release of ITK 6.0.0 Hope that’s fine to you as well!
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