Doom9's Forum - View Single Post - Could you tell me how to calibratea a 1$ color sensor?

StainlessS · 6th April 2018, 11:34

Cant really help, but the same phenomenon can be experienced in subtractive 3 and 4 color printing, CMY/CMYK due to impurities in the colored inks.
Partial correction is done by replacing some component part of the C-M-Y with K black ink, where they call the correction Under Color Removal.
(also saves on ink costs and reduces the amount of ink applied, ie paper dont get quite so soaking wet).

CMY (from memory), Cyan ink tends to contain Magenta (and sometimes a little yellow), Magenta tends to contain quite a bit of yellow, and yellow can in a lot of cases be near perfect. Inks from differing manufacturers can be quite a lot different (there are books written on the subject, complications include printed dot size, and dot spread [EDIT: I used to have a 3 inch thick book called the 'Printers Ink Manual']).

CMY impurities:- https://www.google.co.uk/search?clie....0.02c18cU0stU

Under Color Removal:- https://www.google.co.uk/search?q=un...BsfU8gfNxYiwBQ

Good luck.

EDIT: HP Deskjet used to produce dark green when 3 color CMY used in equal amount to simulate black, many ribbon based printers eg Citizen 24 dot matrix printer used to produce dark red.

6th April 2018, 11:34	#2 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,980	Cant really help, but the same phenomenon can be experienced in subtractive 3 and 4 color printing, CMY/CMYK due to impurities in the colored inks. Partial correction is done by replacing some component part of the C-M-Y with K black ink, where they call the correction Under Color Removal. (also saves on ink costs and reduces the amount of ink applied, ie paper dont get quite so soaking wet). CMY (from memory), Cyan ink tends to contain Magenta (and sometimes a little yellow), Magenta tends to contain quite a bit of yellow, and yellow can in a lot of cases be near perfect. Inks from differing manufacturers can be quite a lot different (there are books written on the subject, complications include printed dot size, and dot spread [EDIT: I used to have a 3 inch thick book called the 'Printers Ink Manual']). CMY impurities:- https://www.google.co.uk/search?clie....0.02c18cU0stU Under Color Removal:- https://www.google.co.uk/search?q=un...BsfU8gfNxYiwBQ Good luck. EDIT: HP Deskjet used to produce dark green when 3 color CMY used in equal amount to simulate black, many ribbon based printers eg Citizen 24 dot matrix printer used to produce dark red. __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 6th April 2018 at 11:42.