This paper presents alternative models for the RGB monitor gamut, focusing on the hexcone and triangle models. The RGB monitor gamut refers to the range of colors produced by the red, green, and blue electron guns in a monitor. It is a linear space that can be represented as a cube, with each dimension corresponding to a primary color. The paper explores two models based on perceptual variables: hue (H), saturation (S), and value (V) or brightness (L). These models are used to transform between RGB and HSV or HSL color spaces. The hexcone model represents colors in terms of hue, saturation, and value. It is derived from the RGB colorcube and is used to describe colors in a way that aligns with artistic intuition. The triangle model, on the other hand, uses hue, saturation, and brightness (lightness) and is a generalization of a model developed at SRI. Both models are used to transform between RGB and HSV or HSL color spaces. The paper provides algorithms for transforming between these models and the RGB colorcube. The hexcone model's algorithms are fast and accurate, making them suitable for real-time applications such as frame buffer painting. The triangle model's algorithms are more computationally intensive but offer greater flexibility in representing color in different contexts. The paper also discusses the importance of psychophysical corrections in color theory, particularly in the context of the NTSC standard. It highlights the differences between value and brightness, and how these concepts are used in different models. The hexcone model is particularly useful for applications where pure hues need to be treated equally, such as in painting programs, while the triangle model is useful for applications where brightness is important, such as in animated cartoons. The paper concludes that the hexcone model's transforms are fast and efficient, making them suitable for real-time applications, while the triangle model's transforms are more computationally intensive but offer greater flexibility. The triangle model is particularly useful for manipulating the NTSC space, as it allows for the easy adaptation to different monitor specifications. The paper also acknowledges the contributions of various researchers and institutions in the development of these models.This paper presents alternative models for the RGB monitor gamut, focusing on the hexcone and triangle models. The RGB monitor gamut refers to the range of colors produced by the red, green, and blue electron guns in a monitor. It is a linear space that can be represented as a cube, with each dimension corresponding to a primary color. The paper explores two models based on perceptual variables: hue (H), saturation (S), and value (V) or brightness (L). These models are used to transform between RGB and HSV or HSL color spaces. The hexcone model represents colors in terms of hue, saturation, and value. It is derived from the RGB colorcube and is used to describe colors in a way that aligns with artistic intuition. The triangle model, on the other hand, uses hue, saturation, and brightness (lightness) and is a generalization of a model developed at SRI. Both models are used to transform between RGB and HSV or HSL color spaces. The paper provides algorithms for transforming between these models and the RGB colorcube. The hexcone model's algorithms are fast and accurate, making them suitable for real-time applications such as frame buffer painting. The triangle model's algorithms are more computationally intensive but offer greater flexibility in representing color in different contexts. The paper also discusses the importance of psychophysical corrections in color theory, particularly in the context of the NTSC standard. It highlights the differences between value and brightness, and how these concepts are used in different models. The hexcone model is particularly useful for applications where pure hues need to be treated equally, such as in painting programs, while the triangle model is useful for applications where brightness is important, such as in animated cartoons. The paper concludes that the hexcone model's transforms are fast and efficient, making them suitable for real-time applications, while the triangle model's transforms are more computationally intensive but offer greater flexibility. The triangle model is particularly useful for manipulating the NTSC space, as it allows for the easy adaptation to different monitor specifications. The paper also acknowledges the contributions of various researchers and institutions in the development of these models.