Get colours from colour palette

[Nok]

I have coded a script that asks the user to select a couple of colours. I want to change the script such that the user has an option of selecting colours or using colours from a colour palette. I tried using the ReturnImageInfo command 's PaletteColorList but its was not being populated. Is there a command I can use to do this? I was using the attached image as a colour palette.

[LeviFiction]

PaletteColorList will only be populated if the image is converted to a paletted image (256 colors, grayscale, that sort of image).

How do you currently have users select colours in the script? Do you pause the script and have users select their own colors? Or do you use the GetMaterial command to bring up the standard color picker?

[Nok]

How do I convert my image to a paletted image?

I used the GetMaterial cmmand.

[Nok]

I have used Image-->Decrease Color Depth-->16 Color Palette and I now have a 16-colour paletted image.