Re: Mixing paint color
Re: Mixing paint color
- Subject: Re: Mixing paint color
- From: RobinDMyers <email@hidden>
- Date: Sun, 28 Dec 2008 22:24:16 -0800
Dear Mr. Southerland,
Mixing paint can start with as few as four primaries, the CMY
primaries plus white, but the color gamut attained with these
primaries would not be very large. To enhance the mixture color gamut,
most paints are mixed from many more primaries. As a working minimum I
would hazard a guess that 8 primaries would be necessary; CMYRGBWK.
The actual mixtures are calculated by using the Kubelka-Munk formulas,
which calculate a spectral match to the customer's test swatch. They
use tables of constants computed from premixed combinations of the
primaries at certain ratios to calculate the mixing ratios for the
test swatch. These equations are too complex to easily type in here,
but you can get information on them in many color science books. I
suggest "Billmeyer and Saltzman's Principles of Color Technology,
Third Edition" by Roy S. Berns.
Robin Myers
On Dec 28, 2008, at 21:59 , Scott Southerland wrote:
Our dinner conversation this evening led to a discussion about paint
colors, which led to spectrophotometry (or rather, "that thingy that
figures out the color of my pillow case"), which led to "How do they
make those colors?". I couldn't answer. I don't believe they're
using CMYK. Can anybody share the basics of how paint colors are
mixed? What are the primaries?
Scott
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