Thank you both for your input but I tried using NCA and it resulted in very dark images and horrible colour rendition.
The reason I printed the original test target and subsequent images using the Colour Control Setting in the printer driver was that this was stated to be an option in a document I have on tips for using Prism. I cannot lay my hands on the origin of the document as it is a few years old now but as I stated it does work for me.
I am aware that it is not normal to use double profiling but surely all that is happening here is that the Prism profile is tweaking the Printer Driver profile to adjust it to work with non-Epson inks and paper.
I need to clarify something.
When we say that you should set the driver to no color adjustment, that is what you need BEFORE you print the target.
You select the correct paper, No COLOR ADJUSTMENT, the Quality setting of BEST PHOTO, and using the JOB preset for printing a target, make a target print.
This should be at ORIGINAL SIZE. The print should be 7.92 x 5.77 inches.
Using NO COLOR ADJUSTMENT is exactly what it means. It tells the driver, "Don't mess with the color. My profile is handling it. Don't mess with my color. I don't need double profiling"
Too dark?
What is too dark. The final print or the target?
PP takes care of the target as long as you tell it my Target image was RAW.
If you did all of the above correctly, and you get a dark print, time to see what the monitor is showing you, and to double check, make a print using either Let Printer manage color as I outlined days ago, or make a print on Epson paper with their profile and see if the same image prints too dark.
Fred
Make your Profile.
NOW, when you make your print using the new profile, you *MUST* set the driver exactly the same way.
Same paper choice, sane print quality, NO COLOR ADJUSTMENT, and the profile must be set in the correct place in Qimage: at the blue ball marked PRTR ICC in Job properties.
I need to clarify that you set No Color Adjustment both times.
Let us know,,,
Fred