I'm an Experienced GMG ColorProof User—What's the New Proofing Strategy?
Basically, the working procedure in GMG ColorProof is the same, whether you are using standard CMYK or OpenColor proof profiles: You create a manual job or workflow and select a proof standard or profile.
The following table lists all differences between working with standard CMYK and OpenColor profiles.
| Feature | GMG ColorProof | GMG OpenColor |
|---|---|---|
| Color management |
CMYK profile + spot color set CMYK process colors are mapped to CMYK profile channels. Spot color channels are mapped to matching spot colors defined in spot color sets. |
Multichannel profile All image channels (CMYK, spots) are mapped to OpenColor profile channels. |
| Number of profile channels | 4 | Up to 15 |
| Characterization data | Lab target values | Spectral characterization data |
| Printing processes | Standardized printing processes such as ISO Coated v2 | Non-standardized printing processes |
| Process specific profiling | Printing process related information is not taken into account. The same spot color set can be used together with any proof standard. | Various process specific parameters are taken into account such as process and media characteristics and surface finishing effects. |
| Overprint simulation | Simple overprint algorithm (Choose / Define Spot Color > Multiply Channels) | Complex and precise overprint prediction based on spectral overprint information and process relevant prediction models |
| Supported proof printers and media types | Wide range supported | Printers with extended color space in combination with GMG ProofMedia |
| Reuse of characterization data | 1-to-1 ratio: Each profile requires its own set of measurement data. | 1-to-many ratio: Measurement data can be flexibly combined to create multiple profiles. |
| Printing ink sequence | You cannot change the print order of CMYK inks. | You can flexibly create a profile for any combination of printing inks, including changing the print order. |
| GMG FlexoProof | Paper texture simulation supported | Paper texture simulation not supported |
| Profiling |
You can create and edit CMYK profiles in GMG ProfileEditor. Custom spot colors can be created and edited in GMG SpotColor Editor, or optimized with the Spot Color Optimization wizard in GMG ColorProof. |
You can create and edit multichannel profiles in GMG OpenColor using various editing tools. Contone profiles can be created almost automatically, on-the-fly. Halftone (DotProof) proof profiles can be created manually only. |
What are the differences in DotProof profiling?
| Feature | GMG ColorProof / GMG ProfileEditor | GMG OpenColor |
|---|---|---|
| RIP parameters | DotProof CMYK profiles take the RIP compensation curve into account. | Multichannel DotProof profiles created in GMG OpenColor take the RIP resolution, screen ruling and angles, and the RIP compensation curve into account. |
| Ink usage | - | The profiling is very precise due to a defined ink usage. |
| Iteration test chart | To optimize the profile, a standard test chart is used | Test charts for optimizing the profile are generated individually for each profile. |
| Spot color dot gain | To simulate the dot gain of spot colors, you need to define gradation corrections in GMG SpotColor Editor. | The dot gain of spot colors is part of the measurement and does not need to be created separately via gradation corrections. |