Canon PRO-1000 print color shift

Evan - on further thinking about this, when you were NOT using Photoshop for printing, the prints were accurate. When you were not using the Canon printer, the prints were accurate. The OS and Mac processor are probably not the issue because you got accurate prints from Preview as well as from Epson printers. I am, I believe reliably, informed that Photoshop uses its own colour management algorithms for printing, not MacOS, the purpose being to assure consistency between Mac, Windows and the updates of both for users printing from Adobe applications. Assuming that you were using application colour management when printing with Preview, and the results were fine, it would suggest the profiles may be OK. This would then narrow the problem to some colour matching issue between recent versions of Photoshop and recent versions of Canon's printer software, (firmware or driver depending on which picks up the RGB output to the printer and converts it to CMYK - I don't know the detail here). Anyhow, upshot is that I would suggest two things (1) if you can, think back about the timing of various Canon software updates relative to the timing of your first seeing this problem, likewise for Photoshop, and (2) raising the issue with Canon's printer specialiast tech support in Melville NY to learn whether they are aware of such problems and could help.

Hi Evan - could you try an experiment with one print, one of those profiles, setting 8-bit in both the printer driver menu and the Photoshop Print function where the choices of 8- versus 16-bit printing are offered, and see whether that improves the situation.

Profiles were created with i1 Profiler, and some with the legacy dropRGB from BasICColor.

Prints are accurate on Intel processor Macs running OS 12.6.4 with PS 20.0.10, and all OS/hardware combinations prior.

Whose ICC profiles are you using? If it doesn't happen with Preview or with Epson printers it would suggest a problem with profiles made for the paper you are using and Canon Pro1000.