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Thermal Imaging Bricklet - Color Palette


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I am using a Thermal Imaging Bricklet to create thermal images. My question is general, but I wanted to know on which formula the generated color palette is based and what's the logic behind it? 

For example in python the color palette creation looks as follows: 

for x in range(256):
        x /= 255.0
        palette.append(int(round(255*math.sqrt(x))))                  # RED
        palette.append(int(round(255*pow(x, 3))))                     # GREEN
        if math.sin(2 * math.pi * x) >= 0:
            palette.append(int(round(255*math.sin(2 * math.pi * x)))) # BLUE

    return palette

Source: https://www.tinkerforge.com/en/doc/Software/Bricklets/ThermalImaging_Bricklet_Python.html 

Does any one know what's the principal behind this color palette?

Thank you!


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