In computer graphics, color quantization or color image quantization is a process that reduces the number of distinct colors used in an image, usually with the intention that the new image should be as visually similar as possible to the original image.
 Computer algorithms to perform color quantization on bitmaps have been studied since the 1970s.
 Color quantization is critical for displaying images with many colors on devices that can only display a limited number of colors, usually due to memory limitations, and enables efficient compression of certain types of images.
"Coat of Many Colors" is a song written and recorded by American country music singer Dolly Parton, which has been described on a number of occasions as her favorite song she has written.
 It was released in October 1971 as the second single and title track from the album "Coat of Many Colors".
The song is featured in episode 1, season 4 of Jerry Seinfeld's web series "Comedians in Cars Getting Coffee."
 While driving down the Long Island Expressway (the highway on which Chapin died), guest Sarah Jessica Parker relates that she and her siblings were the (uncredited) studio performers singing the chorus "There are so many colors in the rainbow..." Parker sings the chorus and Chapin's original version is excerpted.
In show business, a guest appearance is the participation of an outsider performer (such as a musician or actor) in an event such as a music record or concert, show, etc., when the performer does not belong to the regular cast, band or other performing group.
 In music, such an outside performer is often referred to as a guest artist.
 In performance art, the terms guest role or guest star are also common, the latter term specifically indicating the guest appearance of a celebrity.
 The latter is often also credited as "special guest star" or "special musical guest star" by some production companies.
A set of primary colors is a set of pigments, colored lights, or abstract elements of a mathematical colorspace model that can be combined in varying amounts to produce a range or "gamut" of colors.
 Deriving many colors from several primaries facilitates technological and artistic applications such as painting, electronic displays, and printing.
 Any small set of realizable primary colors are "imperfect" in that they cannot generate all perceptible colors, but some sets of primaries can yield a far wider gamut than others.
The "WWE Raw" guest star is a concept which involves a current or former WWE performer, mainstream celebrity or, sports personality making a guest appearance, assuming the on-screen role as a guest star for that particular episode.
 The guest star also often participates in backstage vignettes with members of the WWE roster.
Joshua is the seventh solo studio album by American country recording artist Dolly Parton, released in April 1971.
 It includes "Joshua," her first song to top the U.S. country singles chart.
 The album reached #16 on the country albums chart, and #198 on the pop albums chart.
 The album was released on CD in 2001 as "Joshua & Coat of Many Colors", attached to "Coat of Many Colors" on one disc.
 It was released digitally for the first time on December 4, 2015.
Theo Constanté Parra (May 11, 1934 in Guayaquil, Ecuador – April 27, 2014) was a master Latin American painter part of the Abstract Informalist Movement in Ecuador.
 In 2005, Constanté won the country's most prestigious award for art, literature and culture, the Premio Eugenio Espejo National Award, presented by the President of Ecuador.
 Constanté's works are abstract in nature and consist of many colors which meld together amongst loosely drawn geometric lines.
 Constanté stated that his favorite colors were red, orange and blue and they are the colors that are typically more dominant in his work.
Sarah Jessica Parker (born March 25, 1965) is an American actress, producer, and designer.
 She is known for her leading role as Carrie Bradshaw on the HBO television series "Sex and the City" (1998–2004).
 She won two Emmy Awards for the show: one for Outstanding Comedy Series (as producer) in 2001 and another for Outstanding Lead Actress in a Comedy Series in 2004.
 For this role, she also won four Golden Globe Awards for Best Actress in a Comedy Series and three Screen Actors Guild Awards.
 She reprised the role in the films, "Sex and the City" (2008) and "Sex and the City 2" (2010).
Color in Chinese culture refers to the certain values that Chinese culture attaches to colors, like which colors are considered auspicious (吉利 ) or inauspicious (不利 ).
 The Chinese word for "color" is "yánsè" (顏色 ).
 In Classical Chinese, the character "sè" (色 ) more accurately meant "color in the face", or "emotion".
 It was generally used alone and often implied sexual desire or desirability.
 During the Tang Dynasty, the word "yánsè" came to mean all color.
 A Chinese idiom which is used to describe many colors, "Wǔyánliùsè" (五颜六色), can also mean colors in general.

Question: What nationality was the guest star that sang "There are so many colors in the rainbow..."?
Answer: American