presto-main/src/main/java/io/prestosql/operator/scalar/ColorFunctions.java/ColorFunctions/interpolate
class ColorFunctions:    private static int interpolate(float fraction, long lowRgb, long highRgb)
    {
        float[] lowHsv = Color.RGBtoHSB(getRed(lowRgb), getGreen(lowRgb), getBlue(lowRgb), null);
        float[] highHsv = Color.RGBtoHSB(getRed(highRgb), getGreen(highRgb), getBlue(highRgb), null);

        float h = fraction * (highHsv[0] - lowHsv[0]) + lowHsv[0];
        float s = fraction * (highHsv[1] - lowHsv[1]) + lowHsv[1];
        float v = fraction * (highHsv[2] - lowHsv[2]) + lowHsv[2];

        return Color.HSBtoRGB(h, s, v) & 0xFF_FF_FF;
    }