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+Document the proper gamma functions for
+ ITU_R_BT_601_625_LINE
+ GAMMA = 1 / 0.45 = 2.(2)
+ OFFSET = 0.09929682680944
+ SLOPE = 4.5
+ TRANSITION = 0.018053968510807
+ ITU_R_BT_601_525_LINE (same function as above)
+ ITU_R_BT_709 (same function as above)
+ ITU_R_BT_2020 (same function as above)
+ NTSC_RGB (same function as above)
+ PAL_SECAM_RGB (same function as above)
+ SMPTE_C_RGB (same function as above)
+ SMPTE_240M_RGB
+ GAMMA = 1 / 0.45 = 2.(2)
+ OFFSET = 0.1115721957735072
+ SLOPE = 4.0
+ TRANSITION = 0.022821585552393633
+ SGI_RGB
+ simple: gamma = 1.47