Originally Posted by tiddler
Hey prof how about some help withselecting which Decoart and Folkart metallic paints match these wavelengths?
Here's a way I think will match your projectors RGB.
Use Microsoft Paint (everybody's got Paint, right?)
Draw three rectangles.
Click the fill with color tool. (Paint bucket)
Click on the colors tab to edit colors.
Click the define custom colors button.
Click the bright red basic colors box.
Check the boxes on the bottom right of the window, they should say Red 255, Green 0, Blue 0.
Click the first rectangle you drew and fill it with that red.
Do the colors tab, edit colors, custom colors thing again.
Now click on the green box that is three from the left and three down.
This one should be Red 0, Green 255, Blue 0.
Click OK and fill your second rectangle with that green.
One more time for Blue - colors tab, edit colors, custom colors.
Click on the Blue that is five from the left and four down.
The boxes should say Red 0, Green 0, Blue 255.
Click ok and fill the last rectangle.
(By the way, Sat should stay at 240 and Lum at 120 for all three colors)
These are the colors you have to match in your paints.
Print that Paint file and make sure to save it, you'll need it later.
I know that it won't be absolutely exact, because you will be printing it with a CYMK printer, but it is all we have.
When you visit your Michaels or other craft and paint store get the closest match you can find. Also get the smallest container you can find to use for testing. No point in buying a lot until you know it'll work. While you are there, get a few sheets of black construction paper or equivalent and a few sheets of bright white, too.
You are going to be painting "color chips" on white squares and taping or glueing them onto the black construction paper. It'll be kind of like the color filter test that was done on the "A Slightly Scientific Study of Colored Light " thread.
Cut out four squares of white paper for each sheet of black backing paper. Leave black borders around each square. One square you leave white. The others you paint one red, one green and one blue.
Now project with your projector the Paint file you saved earlier with the red, green and blue rectangles. Stick or hang (or just hold) your "color chip" sheets on your screen, one in each color of rectangle.
Here's what we're hoping for......in the projected red rectangle the red painted square should be almost a perfect match with the red that shows on your unpainted white square. The blue painted square and the green painted square should look black.
In the projected green rectangle the painted green square should be almost a perfect match to the green that is projected onto the unpainted white square. Unfortunately, greens are difficult because they are often made with a mixture of blue and yellow pigments, and that just won't work here. It has to be a pure green pigment. If you've nailed it, congratulations and tell me what brand, color, catalog number, manufacturers part number and/or sku number it has.
Here again, the red painted and the blue painted squares should look black.
Do the same again with the Blue projected rectangle.
Even if they aren't perfect matches, if you are happy with the color intensity and brightness of the color squares, go for it.
If you are not happy with the results of the samples you've tried, well, it's back to the store (and probably looking at the more expensive artists colors, dammit.)
If you go with the metallic paints, let us know how they turn out. It would be great if they intensify or brighten the color without sacrificing too much viewing cone.
If you have to use Artists Acrylics, I suggest starting with Cadmium Red Medium, Cobalt Green Light and Cobalt Blue. (Hopefully pure pigments).