Color reproduction

The human retina contains only three types of receptors, which respond mainly to light in the red, green, and blue parts of the spectrum. Suppose that we equip a digital camera with filters that model the response characteristics of the receptors found in the retina. If the processing done by the retina and by the brain were completely understood, we could compute the same color constant descriptors as are computed by the human brain. This method could then be used for object recognition based on color. 

In order to reproduce the color sensation of an observer, we could reproduce exactly the same spectral characteristic for every point of the image. This sensation would be indistinguishable from the original sensation. However, we do not usually have a spectrometer to measure the entire spectrum for every image point, let alone a method to create a color spectrum given such measurements. However, quite a large number of colors can be reproduced using only three color primaries. 

Color Constancy M. Ebner 2007 John Wiley Sons, Ltd 

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Both subtractive and additive color reproduction are utilized in instant color films. Subtractive systems include all of the instant print and large format transparency materials except Polachrome 35-mm sHde films, which are additive. 

Color reproduction of the chromatograms can be achieved by color photography — the best, but also the most expensive method of documenting thin-layer chromatograms. It can be used not only to produce true-color reproductions of colored zones but also — with the aid of a Reprostar (Fig. 64) or a UVIS analysis lamp (Fig. 6) — of fluorescent or fluorescence-quenched zones. When photograph-... 

Ancona, Mirella Levi d. Botticelli s Primavera a botanical interpretation including astrology, alchemy and the Medici with the first color reproductions of the Primavera since its restoration. Firenze Leo S. Olschki, 1983. 213p. ISBN 88-222-3131-... 

Burley, N. T., Price, D. K., and Zann, R. A. 1992. Bill color, reproduction and condition effects in wild and domesticated zebra finches. Auk 109 13-23. 

Full color printing is essentially the same as for black and white but requires four steps, one each for the yellow, magenta, cyan, and black toners needed for full color reproduction.35,36 Consequently, color laser printers and color copiers are significantly more expensive than both monochrome laser printers and especially ink jet printers. Obviously, they are also slower than monochrome laser printers. 

The simulation discussed above was based on full color produced by individual red, green, and blue emitters. Other full-color reproduction approaches have been proposed for OLED displays including color from blue emitter by means of energy down conversion fluorescent filter [177], and color from white emitters by means of transmission color filter sets similar to that used in LCD industry [178,179]. Table 1.5 compares the EL efficiency of equivalent white... 

EL Efficiencies of Equivalent White Generated by Color Pixels Made by Three Different Color Reproduction Approaches... 

Color reproduction system, characteristics of, 19 232-233 Colors. See also Color... 

Reciprocity failure of the film has two practical implications. The first is seen with the use of color-reversal film. Each of the three color-sensitive layers of the film has a different reciprocity failure factor resulting in incorrect color reproduction during long exposures. To correct for this problem, color-compensating filters can be placed in the light path to the camera. 

B Unicellular to colonial microscopic organisms cells typically with poorly differentiated nuclei and chromatophores motile or non-motile, with or without chlorophyll, never with pure chlorophyll-green color reproduction by binary fission resting spores or cells commonly present without sexuality.Division Schizophyta (Protophyta), Phylum Schizophyta (Page 6)... 

A color correction may also be achieved by using filters. Table 3.1 shows the type of filter used by professional photographers to achieve accurate color reproduction. The required filter depends on the type of illuminant and also on the type of film. The type of light source can be described using the temperature of a black-body radiator. A black-body radiator is a light source whose spectral power distribution depends only on its temperature (Jacobsen et al. 2000). The color temperature of a fight source is the temperature of a black-body radiator, which essentially has the same spectral distribution in the visible region. The concept of a black-body radiator is formally introduced in Section 3.5. 

Table 3.1 Filters that should be used for accurate color reproduction. The filter depends on the light source as well as the type of film used. The filter numbers are references to Kodak Wratten filters. The first digit designates the color and the letter the density of the filter (data from Hedgecoe (2004)).

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