Using all values in a matrix as inputs for a function.

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I am new to Matlab and programming and am hoping that someone can help me out or point me in the right direction with an issue I have run into.

I have a 240x320 matrix (tempK) derived from a thermal image. Each cell in the matrix contains the temperature value of the cosponsoring pixel from the thermal image. I have defined the following function:

    function out=Planck_radconvers(lambda_,tempK)
    C1 = 1.19e-16;
    C2 = 1.44e-2;
    out=C1/(lambda_^5*(exp(C2/(lambda_*tempK))-1))*1e-6;
    end

I then tried to use this function by applying the following:

rad=planck(10.25e-6,tempK)

The issue is that I have only been able to figure out how to get "rad" to out put the result for a single cell in "tempK". However I need it to do this for every cell in "tempK" and I need the output of "rad" to be the same dimensions as "tempK" (i.e. I need each all the converted values from "tempK" to have the same cell locations in "rad").

Any help on this would be very much appreciated.