Original image with 258888 colors

Original image after color reduction
5 color levels
44115 CCs

Image after CCs filtering
3606 CCs

Image after inital grouping procedure
2851 CCs

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Initial grouping for CCs of color plane 3

Final grouping for CCs of color plane 3 (invalid connections removal)

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Final result with all color planes (Tp=0.75)
30 groups
757 CCs