How does pressman hit color on press and have delta e under 2 throughout the press run?

How does pressman hit color on press and have delta e under 2 throughout the press run?

Once the client approves the color on press, please make sure your press prints as consistent as possible. Things to check includes ink/water balance, PH level, press room temperture/humidity variation, press consumerbles, etc. It is helpful to have an automatic spectro scanner in the press room to help the operator to notice any issues on the press within a few seconds.