Original image with 224341 colors

Original image after color reduction
6 color levels
36990 CCs

Image after CCs filtering
3201 CCs

Image after inital grouping procedure
2609 Cs

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Initial grouping for CCs of color plane 5

Final grouping for CCs of color plane 5 (invalid connections removal)

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Final result with all color planes (Tp=0.75)
50 groups
592 CCs