Home / Standards / GB/T 7921-2008 GB/T 7921-2008 Active Uniform color space and color difference formula 均匀色空间和色差公式 Standard Type GBT ICS 17.180.20 CCS A20 Status 现行 Issue Date 2008-06-26 Implementation 2009-03-01 Responsible Dept 国家标准委 Drafting Unit N/A