How to find CIEL*ab value from Bitmap?

[mahendra_g]

Hello

I have an image with 300*300 pixels. I am getting this image from spectral camera.
I want find CIELAB value (*L *a *b) from images.
I want to map the image pixel in 400 to 700 nanometer/Wave length graph.
Please suggest how to get RGB value from image and how put this on
CIELAB equation. Or Suggest right way to achieve this thing.

CIE L*a*b* (CIELAB) is the most complete color space specified by the International Commission on Illumination (Commission Internationale d'Eclairage, hence its CIE initialism). It describes all the colors visible to the human eye and was created to serve as a device independent model to be used as a reference

Thanks
Semaphore