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How I know the temperature scheme for COLORMAP_JET?

I want to print the equivalent temperature of a pixel of an image that is converted by COLORMAP_JET. e.g. an image is 100 x 100 in dimension, then the temperature array be like,

temp[] = {
    { 104, 1000, 600, .........},
    { 34, ,234, 678, ..........},
    { ..........................},
    { ..........................}
}

I want to store those temperatures in an array named temperature.

    applyColorMap(img, im_color, COLORMAP_JET);
    count = 0;
    for (int i = 0; i < img.rows; i++) {
        for (int j = 0; j < img.cols; j++) {
            temperature[count++] = ;/*get temperature here*/
        }
    }

How can I do that?