Control during the print run
Colour control is achieved using a densitometer or scanner to measure the control strip. Measurement results for each colour tell the printer whether to give more or less ink in a certain area. The print must match the original or the fixed system data as closely as possible. Sample prints are scanned and analysed against the original data. By fine-tuning the ink supply, the results come closer and closer to this colour model. Settings can then be stored in integrated software or recorded on computer tapes for optimal print and re-print runs. As soon as the prints satisfactorily match the original and the colours register perfectly, the real print run starts. However the press operator continually takes sample sheets to monitor and maintain ongoing colour and register throughout the run.