I have read some posts about colour issues with printers.
I did post this before and it may be of help.
During colour calibration of the printer, iPF6100 and others I presume, a chart is produced.
KEEP it.
I found that a muddy result on reds was due to print head contamination, shown by a calibration check and putting the latest chart against the previous one, when all was well.
Nozzle check DID NOT show this.
A B clean fixed this.
Here in the UK some suppliers of original Canon inks have sourced them from who knows where resulting in buggered printers.
In my case it was probably a winter lay off and all is well,
My supplier says they have seen this before.
I don't want to lead anyone up the garden path but this may help before looking to buy new heads...............
