Introduction CMYK's Gray Balance and RGB Gray Balance Correspondence

RGB space uses sRGB CMYK uses US Web Coated (SWOP) V2 CMYK with US Web Coated (SWOP) V2 CMYK space under the following printing conditions, using specifications designed to produce good separations with US inks: 300% overall ink coverage Area, negative edition, coated grade material.

RGB0 = C75M68Y67 K90 (Remove the K component is the CMY gray balance)
RGB28 = C72M66Y65 K70
RGB56 = C69M62Y61 K54
RGB85 = C64M56Y55 K31
RGB113= C56M48Y47 K14
RGB141= C47M39Y39 K3
RGB170= C35M28Y28 (The gray balance already does not need the K component to remove the K component, which is the CMY gray balance)
RGB198= C22M17Y18
RGB226= C10M7Y8
RGB240= C5M3Y3 (absolute gray balance, lower than this component value, printing can not see outlets)