Normalized conversion scales the video code values to a fixed range. A conversion without this scaling is called photometric conversion.
One advantage of the ALEXA SUP 3.0 is that the difference between normalized and photometric conversion is reduced compared to SUP 2.0. On the left side you see the video image generated by the processing in SUP 3.0 and on the right side the image generated by SUP 2.0. At the bottom of the page you can switch between normalized and photometric conversion. When you do this, you will notice a visible shift in brightness in the images on the right side. Because of the fixed black point of the new Log C curve in SUP 3.0, this shift does not occur in the images on the left side.