The colour space allows us to understand one model in comparison to another. Usually they include a precise description and mathematical equation to express the colour concept, and a picture of the model to help us visualise the idea. Scientists, however, do need ways to express their ideas, and create colour models that abstractly describe their ideas, and define colour spaces to present their ideas.Ĭolour models are abstract representations of colour. None of these ways of “thinking about colour” are better than the other but they may be better for specific purposes. Consequently, there are different ways to represent colour. For example, we can understand colour from mixing lights, thinking about light wavelengths, how paints are mixed, how we perceive colours, or even naming individual colours. Not only are there different ways to code colours, but there are different ways to consider colours. In RGB we store a colour by values (between 0 and 255) for each of Red, Green and Blue (e.g., rgb(125, 255, 25). On a computer we have many methods to store values: we can use floating point values, percentages (values ranging from 0 to 100), or values between 0 and 1, even a mix of letters and numbers. Consequently, colours need to be changed into numbers and letters. HSB is also known as Hue, Saturation and Value model (HSV) and was invented in 1978 by Alvy Ray Smith.Ĭoding is another way of saying “let’s change the phenomenon into a way we can store it and manipulate it on a computer”. They needed ways to code colour such that it could be displayed on a computer screen, transmitted over airwaves, and so on, in a consistent, convenient and accurate way. Back in the early days of computing, in the 1960’s and 1970’s, computer pioneers wanted a way to consistently record and reproduce colour. In fact, there are many ways to code colours onto a computer. Consequently, it is good to understand different coding methods. In some situations RGB may be easier for a programmer to code, whereas in other situations it may be better to use the HSB model, in comparison to the RGB or others. One simple answer is that sometimes one way is better than another. Now we will focus on coding colours through Hue, Saturation and Brightness (HSB). “ We can either represent a colour in values of Red, Green and Blue (known as RGB colours), or a distance travelled along a continuous hue rainbow.“ Vibrant colors are usually used for setting accents, while pastel and pale colors often appear in the background or in unprocessed photos.Red green blue values along the top, with the continuous hue rainbow Vibrant colors are pure and only exhibit limited amounts of grey, while pastel and pale colors are diluted with grey and are less poppy. The intensity is inversely proportional to the amount of grey in a color. The color intensity is described using one of 7 levels (ordered from the most to the least saturated): The higher the percentage, the closer is the selected color hue to the respective basic hue. The relative percentage of each hue (in the additive color space) is displayed below the color hue name the two numbers sum up to 100%. More complex hues can be described as a composition of two hues (the primary and the secondary), each contributing to the color to a variable degree. The supported RGB codes correspond to the 24-bit system where each component ranges between 0 and 255 (8-bit encoding).Įach color belongs to one of the 8 basic hues: The Art圜lick Color Hue Finder can be used to find color hues from the hex or RGB color codes. Since lighting conditions strongly affect the colors in an image, it is recommended to take pictures in natural light to obtain the most representative color names. Use the left mouse click to toggle between fixating and releasing the target. Once the image is loaded, clicking on the image areas will initiate the color name identification. It finds a color hue for the following types of input: The feature Color Hue Finder provides the hue composition of a color.
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