one last thing, none of the colour names you recommended could be found on the Dulux site. That is the reason I chose this colour.
I found the Dulux color 'Milton Moon'
on the Gray Colorwall selection. I get an RGB value of 177, 180, 178 using a color eyedropper function of a program I run in my Firefox browser called Colorzilla, but I sometimes still use ColorPic - they give the same RGB values.
I am curious how you derive the N value. Is it derived from the RGB values?
If so how can I work this out.
OK, I wasn't "hiding" this information from you, but many people really don't want to know, they just want the final figures. After you get the RGB data of the color you are researching put that data into a free program called OpenRGB
(you want to use the 'Calculator' function of this program which I believe is the default setting for it). Below is a screen grab using the RGB values for 'Milton Moon'.
Be sure the Illuminant is set to D65
and the Observer is set to 2°
(these are toward the bottom-left of the screen).
Directly above the Illuminant setting are the values for the L*ab color space for the RGB values you just put in. The L* value is the "Lightness" of the color (which is 73.026 for 'Milton Moon'). This value divided by 10 equals the N value from the Munsell Color System which in this case would be N7.3026. We only need the first two digits so we would call this an N7.3 gray. The neutrality of the color comes from the "a" and "b" values of the L*ab color space (also called the L*a*b* or CIELAB color space). Positive values for "a" and "b" denote red and yellow, the higher the value the stronger the color. Negative values for "a" and "b" denote green and blue. A perfectly neutral gray would have "a" and "b" values of 0.0 each, but that rarely happens. The "a" value (which is also called a*) for 'Milton Moon' shows that it is a bit greenish and the b* value shows that it is also a bit yellowish, BUT the fact that both of those values are below 2.0 show that the color passes our Acceptably Neutral test. Our neutrality tests are that both a* and b* values are 2.0 to 1.0 for Acceptably Neutral, 1.0 to 0.5 for Near Neutral and 0.5 to 0.0 for Neutral. These are not arbitrary values, but were determined by direct consultation with Dr. Mark D. Fairchild
who is the director of the Munsell Color Science Laboratory and has forgotten more about color science than I will ever know!
Also what are the parameters for a neutral paint. ie how close do the values need to be for it to be within acceptable limits?:dontknow:
And thanks for asking the questions! It proves you want to know what is going on with your screen. I will have to warn you though, this stuff is addictive! :bigsmile:
With this info I can go through and find something a little darker but still within the limits. Also the RGB factors weren't quoted by the manufacturer, I used the colour pic program to decypher them.
Right; sometimes RGB data is given directly by a paint manufacturer and sometimes it can only be gotten from "color picking" their online samples; but even then they are still only approximate.
You are more than welcome!
If I rack in some more post I can post pics of the work in progress!!:hail: