Anaglyphic Color Channels
Anaglyph images may use any combination of color channels. However if a stereoscopic image is to be pursued, the colors should be diametrically opposed. Impurities of color channel display, or of the viewing filters, allow some of the image meant for the other channel to be seen. This results in stereoscopic double imaging, also called ghosting. Color channels may be left-right reversed. Red/Cyan is most common. Magenta/Green and Blue/Yellow are also popular. Red/Green and Red/Blue enable monochromatic images especially Red/Green. Many anaglyph makers purposely integrate impure color channels and viewing filters to enable better color perception, but this results in a corresponding degree of double imaging. Color Channel Brightness % of White: Red-30/Cyan-70, Magenta-41/Green-59 or especially Blue- 11/Yellow-89), the lighter display channel may be darkened or the brighter viewing filter may be darkened to allow both eyes a balanced view. However the Pulfrich effect can be obtained from a light/dark filter arrangement. The color channels of an anaglyphic image require pure color display fidelity and corresponding viewing filter gels. The choice of ideal viewing filters is dictated by the color channels of the anaglyph to be viewed. Ghosting can be eliminated by ensuring a pure color display and viewing filters that mach the display. Retinal rivalry can be eliminated by the (ACB) 3-D 'Anaglyphic Contrast Balance' method patented by that prepares the image pair prior to color channelling in any color.
| scheme | left eye | L | R | right eye | color rendering | description |
|---|---|---|---|---|---|---|
| red-green | pure red | pure green | monochrome | the predecessor of red-cyan;. Used for printed materials, e.g. books and comics. | ||
| red-blue | pure red | pure blue | monochrome | Some green-blue color perception. Often used for printed materials. | ||
| red-cyan | pure red | pure cyan (green+blue) | color (poor reds, good greens) | good color perception of green and blue, no red. Currently the most common in use. Regular version (red channel has only the red third of the view) Half version (red channel is a red-tinted grayscale view. Less retinal rivalry) | ||
| anachrome | dark red | cyan (green+blue+some red) | color (poor reds) | a variant of red-cyan; left eye has dark red filter, right eye has a cyan filter leaking some red; better color perception, shows red hues with some ghosting. | ||
| mirachrome | dark red+lens | cyan (green+blue+some red) | color (poor reds) | same as anachrome, with addition of a weak positive correction lens on the red channel to compensate for the
chromatic aberration soft focus of red. |
||
| Trioscopic | pure green | pure magenta (red+blue) | color (better reds, oranges and wider range of blues than red/cyan) | Same principle as red-cyan, somewhat newer. Less chromatic aberration, as the red and blue in magenta brightness balance well with green. | ||
| INFICOLOR | complex magenta | complex green | color (almost full and pleasant natural colors with excellent skin tones perception) | Developed by the TriOviz company, INFICOLOR 3D is a newer, patent pending stereoscopic system, first demonstrated at International Broadcast Convention in 2007 and deployed in 2010. It works with traditional 2D screens and TV sets (LCD, Plasma) and uses glasses with brand new complex color filters and dedicated image processing that allows a natural colors perception with a pleasant 3D experience. When observed without glasses only some slight doubling can be noticed in the background of the action which allows watching the movie in 2D without the glasses. This is possible with traditional anaglyphic systems when the displacement of parralax is minimal. | ||
| ColorCode 3D | amber (red+green+neutral grey) | pure dark blue (+optional lens) | color (almost full-color perception) | (also named yellow-blue, ochre-blue, or brown-blue) a newer system deployed in 2000s; better color rendering, but dark image, requires dark room or very bright image. Left filter darkened to equalize the brightness received by both eyes as the sensitivity to dark blue is poor. Older people may have problems perceiving the blue. Like in the mirachrome system, the chromatic aberration can be compensated with a weak negative correction lens (-0.7 diopter) over the right eye. Works best in the RG color space. The weak perception of the blue image may allow watching the movie without glasses and not seeing the disturbing double-image. | ||
| magenta-cyan | magenta (red+blue) | cyan (green+blue) | color (better than red-cyan) | experimental; similar to red-cyan, better brightness balance of the color channels and the same retinal rivalry. Blue channel is blurred horizontally by the amount equal to the average parallax, and visible to both eyes; the blurring prevents eyes from using the blue channel to construct stereoscopic image and therefore prevents ghosting, while supplying both eyes with color information. | ||
| Infitec | white (Red 629 nm, Green 532 nm, Blue 446 nm) | white (Red 615 nm, Green 518 nm, Blue 432 nm) | color (full color) | uses narrow-band interference filters, requires corresponding interference filters for projectors, technical requirements comparable with polarization-based schemes. Not usable with standard CRT, LCD, etc. displays. |
In theory, under trichromatic principles, it is possible to introduce a limited amount of multiple-perspective capability (a technology not possible with polarization schemes). This is done by overlapping three images instead of two, in the sequence of green, red, blue. Viewing such an image with red-green glasses would give one perspective, while switching to blue-red would give a slightly different one. In practice, this remains elusive as some blue is perceived through green gel and most green is perceived through blue gel. It is also theoretically possible to incorporate rod cells, which optimally perform at a dark cyan color, in well-optimized mesopic vision, to create a fourth filter color and yet another perspective; however, this has not yet been demonstrated, nor would most televisions be able to process such tetrachromatic filtering.
Read more about this topic: Anaglyph 3D
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