duochrome

plural duochromes

1. The duochrome test, a test used by opticians to refine the correction of refractive error, in which the subject is asked to compare images presented with red and green backgrounds.

   The duochrome should be used as the endpoint procedure for the initial MPMVA .

   2004, Nancy B. Carlson, Nancy Carlson, Daniel Kurtz, Clinical Procedures for Ocular Examination, page 99

   2 more examples

   When using the duochrome, there may not be an exact endpoint because the chances of the spectacle refraction falling into a 0.25 DS endpoint are fairly remote.

   2007, Andrew William Keirl, Caroline Christie, Clinical Optics and Refraction, page 108

   If the responses are not appropriate, then the duochrome is not reliable for this patient and should be ignored.

   2020, David B. Elliott, Clinical Procedures in Primary Eye Care, page 82

2. An image composed of varying shades (grayscale) of two colors.

   Films could also be tinted and toned, resulting in color duochromes.

   2010, Richard Misek, Chromatic Cinema: A History of Screen Color, page 21

   3 more examples

   Where a color original such as a transparency, color print, or color artwork is furnished, additional impact and interest can be obtained with the duochrome.

   1967, The American Pressman - Volume 77, page 24

   […] used two tints for his underpaintings, a duochrome in effect, probably a cool grey tint for the shadows and a golden buff one for everything in sunlight.

   1980, Algernon Newton, Nicholas Usherwood, Algernon Newton, R.A., 1880-1968, page 1918

   The duochrome differs from the duotone in that a fullcolor original is required for its preparation.

   1990, Richard M. Schlemmer, Handbook of Advertising Art Production, page 217

3. A piece of pottery decorated in two colors.

   Duochrome consists predominantly of red or brown on brown, buff, or cream.

   1944, American Antiquity - Volumes 9-10, page 344

   3 more examples

   Jugs 9-10 and 15 are obviously the last vestiges of earlier duochrome ware.

   1931, Studies in Ancient Oriental Civilization - Issues 13-17, page 8

   These bowls were usually red slipped from rim edge down to several inches below the widest diameter, making the bowl a duochrome with red upper-body and tan lower-body.

   1976, Bruce T. Ellis, Paul Alfred Francis Walter, Journal of the Museum of New Mexico, the Archaeological Society of New Mexico, the Santa Fe Society of the Archaeological Institute of America, page 16

   Unidentified black-on-gray (probably a duochrome related to the Chihuahua series), La Junta Focus.

   1986, J. Charles Kelly, Jumano and Patarabueye: Relations at La Junta de los Rios, page 148

4. A color scheme consisting of only two hues.

   A dank duochrome prevailed, matte silver and green-black, curled fog strangling the pines.

   2018, Jonathan Kellerman, Jesse Kellerman, A Measure of Darkness

   1 more example

   All was immaculately in keeping, a duochrome of terracotta and brick, with niches for Elizabeth II matching those of her great-great grandparents, Victoria and Albert, on the North Porch.

   2010, Roger Williams, The Royal Albert Hall: A Masterpiece for the 21st Century

5. Fabric that shifts between two colors, depending on the angle of light, also, by extension, something made with such fabric.

   Duochrome flecks sparkled yellow on the plane's dark seats.

   2019, Dahlia Adler, His Hideous Heart

   2 more examples

   So she'd worn one of her own creations, a duochrome that shifted from turquoise to a rich blue depending on how the light hit it.

   2016, Opal Carew, Meat

   I'm like—like boring old burlap and you're a duochrome, ombre, brilliant rainbow.

   2020, 10 Things I Hate about Pinky, page 61

6. A fluorochrome that shows up in either of two colors, depending on the type of biological material it stains.

   […] which seem to be positive for two fluorochromes, i.e., the intact duochrome and the first component of the disintegrated duochrome.

   1997, Ivan Lefkovits, Immunology Methods Manual, page 1851

   1 more example

   Commercially available Cy7 duochromes have highly variable fluorescence properties from batch to batch as there appears to be little regard to standardization with respect to conjugation ratios used.

   2008, Hua Gu, Klaus Rajewsky, B Cell Protocols, page 185

1. not comparablePertaining to the red and green colors of the duochrome test.

   the operator begins at the centre, chooses a colour, follows the colour out to duochrome balance, then proceeds to the periphery.

   1976, South African Archives of Ophthalmology, page 94

   2 more examples

   Cockerham claims that there are a number of advantages with his duochrome fixation attachment over the ordinary illuminated target.

   1960, George Henry Giles, The Principles and Practice of Refraction, page 173

   One standard on duochrome filters recommends a green filter having a peak luminosity of approximately 535 nm and a red filter of approximately 620 nm

   2006, William J. Benjamin, Borish's Clinical Refraction

2. not comparableComposed of two colors.

   A drab series of duochrome fashions reflected the comparatively flat progression of the country through the first half of this century.

   2012, Robin Boyd, The Australian Ugliness, page 42

   4 more examples

   We were boldly duochrome in our bear-up black sweatpants and white sleeveless T-shirts with crosses and religious medals dangling from our necks, sort of a City Ballet meets St. Mark's Place kind of look.

   1998, Holly Hughes, David Román, O Solo Homo: The New Queer Performance, page 73

   Duochrome monotony of gray weather recalling Cage's Four Minutes Thirty-Three Seconds of silence, making Julian hungry to see something with a feeling attached.

   2005, James Greve, Stumble Out On Deck, page 441

   The initial effect is of some vast, elegant set of combination locks, or duochrome Rubik's cubes, poised at any moment to whirr and counterspin, floor by floor,

   2014, James Meek, Private Island: Why Britain Now Belongs to Someone Else, page 202

   This required each duochrome page to go through the printing press twice, and it was soon discovered that it was more efficient to pay scribes to add the rubrication.

   2022, Emma Smith, Portable Magic: A History of Books and their Readers

1. not comparableIn two colors.

   Mark showed his father how you could push down two of the coloured ballpoints at once, and so write duochrome.

   2014, Will Self, Will Self's Collected Fiction