Lighting Formulas

Luminance from RGB (Digital ITU BT.601)

Y = 0.299 R + 0.587 G + 0.114 B

Notes

• Appears to be used in some more recent (Cata?+) shaders

References

• http://stackoverflow.com/a/596241/6770172
• http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.601-7-201103-I!!PDF-E.pdf