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Ah now I understand what you mean by saturation-off scale.
No you do not worry about how high the spike is, it's irrelevant.
We only are concerned with the x-axis, this is a scale from 0-255 and is the brightness value of each pixel.
Since there is 8 bits per pixel we have 256 levels and since we have 3 channels this gives 256 x 256 x 256 combinations of levels hence 16.8 million colours.
The height of the scale (y-axis) only represents how many pixels are actually at that brightness level so it could be very high or off scale since it's only a graphical representation and scaled to fit the chart.
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