Grass Valley EDIUS Pro v.7.4 Reference Manual - Manual (Page 346)

Chapter 7 Applying Effects — Checking Color Data
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In the case of black color matte clips created in the safe color range, IRE0 appears. (at the position of (2)) Adjustment is not necessary
when IRE is a minus value.
(2)
If the luminance is high, the following screen is displayed.
If the luminance is low, the following screen is displayed.
In this case, you need to adjust IRE within the range between 0 and 100. To easily adjust it, apply the color balance of a video filter to the
clip. Open the settings dialog box of the color balance, and select the [Safe Color] option to automatically adjust the IRE of the clip between
0 and 100.
“Adjusting Color Balance” (w page 312)
2
f Although Safe Color clips a range of luminance 16-235 and chroma 16-240, and the chroma is not automatically included in the safe area,
it is calculated to include luminance/chroma within IRE0-100.