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Carlos E. R. schrieb:
Only one driver was offered?
yes for this printer only one. But I tried several others, normally older LaserJet-Drivers should work for newer printers, but do not support all functions or color-printing. But result is always the same, even when using a b/w-driver. On the CUPS Printer Test Page the interpreter information always reports "Postscript Level 3", but the version differs: Version: 3015 (1) Product: HP LaserJet 400 color M451dw Serial #: 0 Version: 3010 (952) Product: GPL Ghostscript Serial #: 42 Resolution is 600x600 dpi, sometimes only 300x300 dpi, but same print quality. I also have a "HPLIP Printer Test Page", it says: HPLIP Version: 3.21.10 Model: HP LaserJet 400 Color m451dw Went back to MacOS X 10.13, printed the same documents, perfect quality. No more ideas. Kind regards, thg