This software has a tools to analyzing brightness of images in three standard:
1- ITU601-ITU-T 709 1250/50
2- ITU709-ITU-T 709 1250/50
3- SMPTE 240M (1999)
This item work as a laboratory for study about brightness in images and their changes. For using this ability you should use "Analysis->Brightness Lab" menu. As you can see in Fig 8-2, a window will be appeared and you can select different standard for calculation of brightness.
Figure 8‑2. Brighness Lab