Exposure calibration for colour recorder or printer - involves computation of darkening function for nominal grey values for determn. of corrective transfer function
摘要
A front-end computer (10) comprising a scan generator (10') and calculation stage (10'') is used with a raster image processor (11), recorder (12), film processor (13) and measuring device (14). A transfer function is determined from pixel-by-pixel and line-by-line exposure of the recording material, using a linearly patterned scan and measuring the surface coverage of the developed pattern. Relative darkening increases are used to derive the effective increase of a scanning point with allowance for provided scan parameters. ADVANTAGE - Nearly automatic calibration can be performed with greater accuracy in shorter time, relieving operator of routine tasks.
申请公布号
DE4303081(A1)
申请公布日期
1993.08.19
申请号
DE19934303081
申请日期
1993.02.04
申请人
LINOTYPE-HELL AG, 6236 ESCHBORN, DE
发明人
MASKELL, DAVID, 6370 OBERURSEL, DE;THIESSEN, HANS-HENNING, 6233 KELKHEIM, DE