Comparing side-by-side 24bit-colour against SCQ colour reduction

Below is a list of side-by-side comparisons between the 840x472 24bit-colour and different SCQ settings.
Upto 16 colours use a 5x5 grid to calculate averages, 32 and 64 colours uses a 3x3 grid.

Down-left of diagonal is the 24bit-colour and upper-right the palette version.

Clicking on the image opens the accompanying animated GIF.

Note: GIFs are around 25Mbyte each.

4 colours:
sbs-4-5x5

5 colours:
sbs-5-5x5

6 colours:
sbs-6-5x5

7 colours:
sbs-7-5x5

8 colours:
sbs-8-5x5

9 colours:
sbs-9-5x5

10 colours:
sbs-10-5x5

11 colours:
sbs-11-5x5

12 colours:
sbs-12-5x5

13 colours:
sbs-13-5x5

14 colours:
sbs-14-5x5

15 colours:
sbs-15-5x5

16 colours:
sbs-16-5x5

32 colours:
sbs-32-3x3

64 colours:
sbs-64-3x3