Jim Allan wrote:
John W Kennedy wrote:
On Sep 8, 2008, at 2:51 AM, Rob Clement wrote:
I am looking at incorporating colours into some templates for
OpenOffice eBook templates and have come across the concept of a
colour (color) wheel. The idea is that colours (colors) that are
opposites on the colour (color) wheel should be used to contrast to
one another.
Has anyone ever developed a colour (color) wheel using the standard
colours (colors) and names of colours (colors) from the OOo standard
pallete? I do not want to complicate things by getting other colour
(color) pallettes.
Alas, color space (as perceived by most human beings) is
three-dimensional, not two, and shaped more or less like a cylinder.
(Four-dimensional, if you include a transparent-opaque axis.) And the
axes aren't linear, either.
There's a reason that color matching is a billion-dollar industry.
Also, a lot of colors actually employed use three visible colors, that
is some red, some blue, and also some green in varying quantities. Such
colors can’t be shown at all on the standard two-dimensional color
wheel, unless you want to grade from pure color to third color mixed
rather than from dark to light.
No matter what you do, you will be missing some colors or hues.
Jim Allan
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I work in QA for a catalog printer and deal almost daily with color
issues with print jobs. Color space is a a very open ended subject that
is continually changing. The links provided give some idea of color and
its analysis. The Efg2 site has a number of computer programs to play
with different concepts. The X-Rite site has a pdf that explains the
different color spaces from a printing point of view.(X-Rite is the
Microsoft of the color measurement industry) I have a great many more
links at work as I try to grasp color technology(Been working at it for
11 years).
Color is a creation of the mind, and what I see for color is not the
same as what you see,so there is ongoing research in trying to quantify
color. A great deal of research is ongoing in trying to get RGB
monitors to give the same visual effect as CMYK printed matter. Trying
to get inkjet proofs that match what a press is capable of printing. And
new printing methods and technologies. CMYK has a much smaller color
space than RGB and this makes it difficult to reproduce continuous tone
images with half-tone dots. As was mentioned, a great deal of money is
spent in color matching and measurement.
http://www.efg2.com/Lab/index.html
http://www.poynton.com/Poynton-color.html
http://www.xrite.com/documents/literature/en/L10-001_Understand_Color_en.pdf
TomW
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