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ChromaDepth 3D Glasses: How they work
They pull warm colors to the foreground (red, orange, yellow) which creates the illusion of warm colors floating over the image. Green serves as a neutral middle ground color. Cool colors (blue, indigo, violet) are pushed into the background. This makes it look like these colors are sunken into or below the image. Black and white accentuate the stereoscopic illusion. Increasing the viewing distance serves to amplify the optical illusion.
ChromaDepth 3D glasses are a great way to transform any R.O.Y.G.B.I.V. color compatible image (needlework, painted, printed, digitally displayed, etc) into an amazing 3D work of art. But the nice part aside from nearly every viewing angle being the "sweet spot" is you don't have to have all of these colors present to achieve this.
ChromaDepth 3D Glasses are made by American Paper Optics.