Get percentages of custom palette colors?

[shokan22]

I want to detect percentages of my artist's oil colors in any area of a vectorized photo that I point to.

So, I want to first vectorize a photo to reduce it to manageable separate color areas. Then, I want to be able to get a list of the various percentages of 108 different colors that make up any of the vector color shapes I point to or select. These 108 different colors are somewhat accurate small bitmap swatches that correspond to 108 artist's oil paint colors.

Alternatively, can I just somehow plug in this 108 swatch palette and have a software (Xara?) break down a bitmap into areas of vector color using only this custom palette?

Is this possible in Xara, or by any other means you know of?

Thanks.