How to return array of pixel values associated with image matrix (C)?

I am using imagesc to map my array, C, to a full color image. The colors of parts of the image determine the phases of the data. I would like to determine the thresholds for ranges of pixels (ranges that correspond to phases of the data). How can I retrieve the pixel values that MATLAB automatically assigns to my data in matrix C?

clim = [0 100]; %set range for pixel color

I = imagesc(flipud(C),clim);

b = colorbar;

Answer 1

[Matthew Eicholtz]

Try using mat2gray.

I = mat2gray(flipud(C),clim);

EDIT: the code above will make I range from 0 to 1. If you want it in the range of clim, add this line of code:

J = I*(clim(2)-clim(1))+clim(1);