色彩管理技术PPTPaperCharacterizationTaskForcebyFogra.ppt

Paper categorization in ISO 12647 Problems of present paper categorization Possible new paper shades for ISO 12647-2 Range of OBAs Measurement and visual perception Parameters affecting the visual apperance of prints *Dr. Uwe Bertholdt; bertholdt@fogra.org Papercategorization ISO TC 130 WG 3 TF 1, Bangkok 25.4.2007 Paper characterization task force ? Initiated by ICC and ISO TC 130 in Leeds 2006 ? Organized within ISO TC 130; WG 3/4 ? Convenor: Uwe Bertholdt Offset PT 1,2 ; 3 ; 4,5 represent different tone value increase aims Data given for white backing ? papers for web offset not appropriate represented (printing condition for SC paper developed in ECI web offset working group) ? colour shades of papers in North/Central Europe and in North America have drifted away ? fluorescent whitening agents ? tone value increase of papers differs within paper type Paper characterization task force ? Aim: to develop new paper shades for ISO 12647-2 based on present papers (Printing industry does not require special shades!) ? Proposals from M-Real and SAPPI to be verified by measuring and exchanging paper samples ? more than 500 Papers from Europe, Asia and America measured at Fogra ? 277 papers with grammage below 140 gsm and no strong tint considered Mean: L* 95,2; a* 1,2; b* -3,4 Double coated glossy papers (HWC) (95 – 140 gsm) wb proposed: L* 95,0; DL* 2,0; a* 1,2; Da* 1,0; b* -3,5; Db* 2,5; 83% included Double coated glossy papers (HWC) (95 – 140 gsm) wb Mean: L* 92,9; a* 0,6; b* -4,4 Double coated glossy papers (HWC) (95 – 140 gsm) bb proposed: L* 93,0; DL* 2,0; a* 0,7; Da* 1,0; b* -4,0; Db* 2,5; 92% included Double coated glossy papers (HWC) (95 – 140 gsm) bb Mean: L* 95,6; a* 1,2; b* -3,0 Double coated matte papers (HWC) (95 – 140 gsm) wb proposed: L* 95,0; DL* 2,0; a* 1,2; Da* 1,0; b* -3,5; Db* 2,5; 75% included Double co