</s> ▁The ▁Pro Photo ▁R GB ▁color ▁space , ▁also ▁known ▁as ▁R OM M ▁R GB ▁( Reference ▁Output ▁Med ium ▁Met ric ), ▁is ▁an ▁output ▁referred ▁R GB ▁color ▁space ▁developed ▁by ▁K od ak . ▁It ▁offers ▁an ▁especially ▁large ▁gam ut ▁designed ▁for ▁use ▁with ▁phot ographic ▁output ▁in ▁mind . ▁The ▁Pro Photo ▁R GB ▁color ▁space ▁en comp ass es ▁over ▁ 9 0 % ▁of ▁possible ▁surface ▁colors ▁in ▁the ▁C IE ▁L * a * b * ▁color ▁space , ▁and ▁ 1 0 0 % ▁of ▁likely ▁occurr ing ▁real - world ▁surface ▁colors ▁documented ▁by ▁Po inter ▁in ▁ 1 9 8 0 , ▁making ▁Pro Photo ▁even ▁larger ▁than ▁the ▁W ide - g am ut ▁R GB ▁color ▁space . ▁The ▁Pro Photo ▁R GB ▁prim aries ▁were ▁also ▁chosen ▁in ▁order ▁to ▁minim ize ▁h ue ▁rot ations ▁associated ▁with ▁non - linear ▁tone ▁scale ▁operations . ▁One ▁of ▁the ▁down s ides ▁to ▁this ▁color ▁space ▁is ▁that ▁approximately ▁ 1 3 % ▁of ▁the ▁represent able ▁colors ▁are ▁imag inary ▁colors ▁that ▁do ▁not ▁exist ▁and ▁are ▁not ▁visible ▁colors . ▁ ▁When ▁working ▁in ▁color ▁spaces ▁with ▁such ▁a ▁large ▁gam ut , ▁it ▁is ▁recommended ▁to ▁work ▁in ▁ 1 6 - bit ▁color ▁depth ▁to ▁avoid ▁poster ization ▁effects . ▁This ▁will ▁occur ▁more ▁frequently ▁in ▁ 8 - bit ▁modes ▁as ▁the ▁gradient ▁steps ▁are ▁much ▁larger . ▁ ▁There ▁are ▁two ▁corresponding