Need help in quantizing an image(using adobe photoshop CS3)

Hi All,
I am using window and adobe photoshop CS3 extended. I had an image whereby i had already perform histogram equalization. I would like to quantize the image obtained into 2 bits per pixel, per channel. Can anyone advise me? The image is a 24 bit colour BMP file whereby the bit depth is 24 bits. Pls advise.

Hi, I managed to find the refresh cached option. However there is still one thing which i need some clarification on.
The problem for me is to quantize the image into 2 bits per pixel per channel. I understand from the previous post that i need to use posterize and set it to 4. My questions are as follow.
1) why must the value be 4? if the value is 4 then there should be 8 bits, but my question require a total of 6 bits only
2) After saving my quantized image, the properties of the image still show me the bit depth being 24, thus is there any where whereby i can check that each color pixel is exactly represented by 2 pixels?
Hope you can advise. Tks

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