A new dynamic color control module for KBA's DensiTronic S densitometry and spectrophotometry system can reduce ink-related start-up waste by as much as 80 per cent, and speeds up ink-key settings into the bargain. With conventional control systems, the specified densities for each ink key and inking unit are set at different times. Where image area coverage is 40 to 100 per cent, ink density is stable after 80 to 120 sheets, so no acceleration is needed. But where coverage is less than 5 per cent, the slowest ink key takes very much longer to run up to target. Since every color is normally of equal importance, the slowest ink key more or less dictates the quality of the image delivered. With dynamic color control, the low-coverage areas are initially overinked, which cuts the time-frame required to achieve the specified density. Even with an area coverage of less than 5 per cent the target range can be reached in just 120 sheets. The system can also be used to reduce inking. But although it brings overinked keys up to target much faster, the effect is limited by the fact that ink keys cannot have a negative setting, so control algorithms must be set to ensure that new target values are based on the lowest inking level. Handling could hardly be simpler. The image area coverage on which the dynamic controls are based is calculated using the CIP3 job files displayed in the DensiTronic S monitor. If the Rapida press is networked with LogoTronic Professional then area coverage data are subsequently transferred directly to the DensiTronic S system. Big reduction in start-up waste The dynamic color control module is compatible with any Rapida sheetfed press embedded in a DensiTronic S or DensiTronic Basic color management system, so even older models can benefit from the enormous cost savings it delivers. For Rapidas built in or after 1995 the upgrade takes the form of a software plug-on for the DensiTronic desk. On new installations enabling is optional. Dynamic color control has been installed in all the Rapida presses at KBA's customer showroom in Radebeul, and can therefore be included as part of a press demonstration.