How can I map a list of 24x3 RGB elements to a list of 256 levels?

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Abdul Rahim Mohammad 2019-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/455333-how-can-i-map-a-list-of-24x3-rgb-elements-to-a-list-of-256-levels

评论： Abdul Rahim Mohammad 2019-4-10

I need to map a list of 24x3 values with each row represnting a RGB value to a list of 256x3 elements. I was advised that I would find the function polyfit helpful but I do not understand how polyfit works and how it maps elements. Any clarification or suggestions or a simple code snipped explaining how poyfit works would be helpful. Thank you.

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Jan 2019-4-9

With polyfit you fit a polynomial to a set of data. You did not explain if you expect the 24x3 data table to match a polynomial and duplicate sample are mentioned the first time now.

Vague questions are welcome in this forum. It is thenature of questions, that some details are not clear to the asking person. As soon as all details are clear, the solution is usually trivial.

So please explain, why you or your teacher thinks, that the data table is approximately a polynomial.

Abdul Rahim Mohammad 2019-4-10

Edit: I understand now where I was wrong,

The process I followed is to take samples from two 24x3 arrays and use a polyfit(1st_array, 2nd_array, order of polynomial I want to fit), use the resultant values from polyvfit for polyval( resultant coeffs of polyfit, scale I want to fit into i.e. 1:256);

Thank you very much for your responses, Jan. They helped me alot.

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