A common issue when using custom proof standards is high dE readings during verification.
It may be the case that everything is working as expected except for selected standards – for example ISO Coated v2 (39L) passes with no issue, the calibration is good and the environment is okay, but a particular proof standard persistently fails verification.
Why does this happen?
This problem can occur when the XML for ProofControl has been generated from target values that no longer reflect the way the profile is printing. The profile may have color corrections made to it, or it was not iterated close to the target values.
How can I make my custom proof standard pass again?
The target values inside your MX4 must be reset and recalculated before generating a new XML file.
- Go to Tools then Reset Target Values.
- Go to Measure then Estimate Target Values from CMYK.
- If the gamut is missing from the MX4, a warning will appear. Go to the Common tab and check in the bottom right-hand corner. Separation should be set to 'Inkjet' or 'Multicolor Inkjet', and the gamut path should be linked to the gamut file used by the calibration.
- During the calculation, tick 'Use Dot Gain' but leave the other checkbox unticked.
- Save the profile (give a different name if desired).
- In ColorProof:
- Go to the Database tab then Proof Standards.
- Open the properties of the relevant Proof Standard, or create a new one.
- Under Colour Management, link to the newly adjusted MX4 file (if changed).
- Under Proof Verification, click the Bin button (if applicable) and then the Green Tick (from Contone MX4) button.