You may turn any measurement into an OK sheet. This creates a reference target that can be used after a client has approved a press sheet during the run or if the job is run at a future date. There are multiple situations where you do not need to compare to a Printing Reference, but you need to compare it to a previously printed sheet. You can accomplish this by defining any sheet or group of sheets as an OK sheet, and then instead of the Print Aim being the ICC Profiler representing the Printing Reference, you can select the OK sheet, and all calculations will be compared against this condition.

OK Sheets are not intended as the primary standard target for an organization, as managing every press run independently from each other is not practical. They are also often determined by the press operator and the visual environment in which the approval was completed, making them very unpredictable. For this reason, the organization should have a standard target, such as GRACoL, and use the OK Sheet for unique purposes.

Global OK Sheets are effective within ChromaChecker Projects:

1. Global OK Sheets as ICC Profile Replacements: Only OK sheets saved as Global can be used as replacements for ICC profiles for Projects.
2. Process Color References: When a Global OK Sheet is connected to a Project, it provides reference values only for process colors (CMYK, nCLR, ECG). References for spot colors are always taken from the library or color palette.
3. Spot Color Handling: Remember that Projects have their definitions of color standards. Spot colors must be saved as a library or palette; otherwise, they will be ignored. Palettes serve as sources of substitute color definitions, corrected for a specific task.
4. Control Strip Considerations: When selecting a control strip for your project, ensure that all process color patches exist in the OK sheet; otherwise, there will be no references for those colors.
5. OK Sheet Creation: You can save one or more grouped measurements as a Global OK Sheet within Print Inspector. In the track where the measurements are stored, select one or more, and by clicking the "Group/OK / Baseline button on the bottom bar, export as a Global OK sheet.