RYB color model RYB color model RYB (an abbreviation of red–yellow–blue) is a historical set of colors used in subtractive color mixing and is one commonly used set of primary colors. It is primarily used in art and design education, particularly painting. RYB predates modern scientific color theory, which has determined that cyan, magenta, and yellow are the best set of three colorants to combine, for the widest range of high-chroma colors. RYB (red–yellow–blue) make up the primary color triad in a standard artist's color wheel. The secondary colors purple–orange–green (sometimes called violet–orange–green) make up another triad. Triads are formed by three equidistant
Judo rules Judo rules This article describes the rules of judo. The main sections of the article describe the rules that apply to any situation in which judo is practiced, and those rules which apply only in judo competitions. Separate sections describe the history of the rules of judo, provide links to other sources of information on judo rules, and list the references for this article. The scoring rules in use starting in 2017 are as follows: The following rules are no longer in use: Two types of penalties may be awarded. A "shido" (指導; literally "guidance" or "instruction") is awarded for