- Joined
- May 29, 2007
- Messages
- 2,656
- Reaction score
- 1,425
- Points
- 313
- Location
- Ghent, Belgium
- Printer Model
- SC-900 ET-8550 WF-7840 TS705
I'm just showing in my above table the luminance levels L* of the black patches of the various ink/paper combinations w/o and with a GO overprint.
I have supplemented the table here with the complete Lab values to adddress another aspect - the color - the tint of these black patches - how neutral are these black inks actually
_____________Sihl/Aldi______Netbit/Aldi____HP Premium Plus
Epson P700_____5,25/---______7,80/ 9,23_____ 8,28/ 7,02 L
Photoblack____-0,19/---_____-0,47/-1,00_____-0,54/-1,23 a
______________-2,06/---_____-3,30/-1,11_____-3,15/-0,85 b
Epson P800_____2,69/---______3,80/ 6,23______4,27/ 3,65 L
Photoblack____-0,21/---_____-0,20/-0,51_____-0,35/-0,42 a
______________-0,78/---_____-1,18/-2,06_____-0,96/-0,07 b
Canon PFI105___2,28/---______8,79/ 5,51______6,92/ 4,82 L
Photoblack____-0,09/---_____-0,91/-1,08_____-0,83/-0,63 a
(Pro10s)______-1,38/---_____-5,51/-3,70_____-5,06/-2,63 b
You can see that the b value -b into the green direction - varies between -5.5 and -0,07 for the various ink and paper combinations - with or w/o GO. Not all of that is visible as a tint but the prints with a b=-5.5 or -5 look slightly cooler than the other black patches in direct comparison. This just applies to the pure black patches - I'm not measuring and comparing gray patches here or with other printers, printers with light gray inks and a ABW mode may deliver rather different results, probably interesting but I don't have such printers and inks available.
Did you try to put LLK in the GO overprint. I think this would mimic the real situation with both the P800/P700, as these printers don't use GO, but LLK instead ?