Driving a printer in Contone vs Multichannel:
1. The "Not CT-mode" is driving the printer in multichannel as you have access to all ink channels and use your own screening.
2. "CT-mode": In the calibration process you calibrate the printer in only CMYK, and use the Epson driver native screening.
Multichannel driver: you can recognize it in the printer driver list as for example "Epson Stylus Pro 7900/9900" or the "Epson WT7900". The software is doing the ink separation by itsself.
You can profile it using only a standard 3rd party cmyk profiling applications, like Monaco or Profile maker, this because the Proofmaster color engine can not generate a 6 color (multichannel) ICC profile.
Contone driver: You can recognize it in the printer driver list as for example: "Epson Stylus Pro 7900/9900 (CT)". In this driver we linearize only the CMYK and the printer does the inksplit internally to all inks.
Since this driver uses regular CMYK icc profiles you can profile it using our internal profiler or use standard 3rd party CMYK profiling applications.
If you have additional colors, like for example orange and/or green, they will also be included into the profile. Only the liniarisation is done in CMYK, the ICC will be built for all colors, orange and green included.
This driver is also easier to calibrate. We recommend this mode, CT, to do normal printing.
You can recognize the profiles for the CT driver by the tag "(for CT driver)" in the name. Do NOT use the CT profiles for the multichannel driver and visa versa.
To get good results with colors and screening/error-diffusion similar to the Epson OS driver it is recommended to use the contone version (CT).
The standard driver should be used only in rare cases like:
• The gamut needed is not achievable with the Epson
• Custom inks are used