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Actually the specific color values of your basic colors do matter a lot. If they are supposed to be arbitary and subject to change - then read my previous post.

But if you are talking about 8 RGB color cube vertices:

1. Red        (255, 0, 0)

2. Green     (0, 255, 0)

3. Blue       (0, 0, 255)

4. Yellow    (255, 255, 0)

5. Magenta (255, 0, 255)

6. Cyan      (0, 255, 255)

7. White     (255, 255, 255)

8. Black      (0,0,0)

then this is just another story.

In this case there is a simple way to normalize your image: just go to each chanell and apply Image->Adjustments->Threshold with Threshold level 128.

To make separate layers for each basic color just record simple action:

For each basic color:

a) Set foreground color to this color

b) Go to Select->Color Range, uncheck Color Clusters, set Fuzziness to 0, hit Ok. c) Make new layer via Cut.

d) Select Background layer.

Proceed to next color.