i have an RGB image and i would like to convert it into numerical data

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the image below uses an RGB scale to show the magnetic field strength at each point on the map. I've been struggling to find a way to convert this image into an array that shows the x and y coordinates of the pixel along with the magnetic field value at each coordinate using MATLAB
The radial component of the field scaled to +.- 220 nT.jpeg

Accepted Answer

Theron FARRELL on 13 Jun 2019
I suppose you know how to read an image
% I will be a numerical array, then
I = imread(...)
% Then you may use
% k is ones of channels
surf(I(:, :, k));
mesh(I(:, :, k));
% If you want to examine each pixel precisely, you may use

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