Color - Contenido educativo
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Cómo se percibe el color.
Hola, holita. Bienvenidos al curso de uso del color.
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My name is Ramón and we are going to start with a brief introduction to color and color perception.
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In this introduction to color management we will discuss what color is and how it is perceived.
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Color is a sensation that we perceive through the sense of sight and it occurs when light illuminates
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an object or an image this light is reflected and reaches our eyes so how do we perceive color
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through visual cells in the retina of our eye known as rods and cones
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rods are the light sensitive visual cells and cones are the visual cells capable of perceiving
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colors therefore in our eyes we have three types of cones that are sensitive to the colors red green
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and blue these colors will sound familiar because we will discuss rgb red green and blue later on
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since we are talking about light and how we perceive it we will need to discuss the visible
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spectrum of light for the human eye, because animals may have a broader or a narrower visible
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spectrum. Our spectrum ranges from 400 nanometers to 700 nanometers. Anything outside of this range
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falls into the ultraviolet infrared wavelengths, but we cannot perceive it. We will refer to colors
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as any wavelength that falls within these ranges.
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If the human eye perceives an equal amount of all wavelengths,
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what we will see is white light.
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In fact, in the image of the right,
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you can see that all wavelengths are reflected from the white object.
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When we see a black object,
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All wavelengths hit the object, but none are reflected, and as a result, we perceive it as black.
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I'm showing this image to illustrate that when all wavelengths hit an object, but only one is reflected, that is the color that we perceive.
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Now that we have discussed color perception, let's talk about classification.
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We have two groups of colors, additive or light colors, and subtractive or pigment colors.
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Additive colors consist of red, green, and blue, often referred to as RGB.
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These are the colors used in screens such as mobile devices, tablets, computers, computer monitors, television, etc., as they emit light.
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On the other hand, we have subtractive colors, which are used in various printing methods,
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like flexography, offset printing, digital printing, and screen printing.
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These colors are cyan, magenta, and yellow, to which black is often added,
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although the primary subtractive colors are cyan, magenta, and yellow.
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Now that we have two color groups, let's talk about additive synthesis, specifically the colors of light.
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Mixing different lights will give us different colors.
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The primary colors for additive synthesis are red, green and blue, as shown in these circles, red, green and blue.
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The combination of two primary colors results in a secondary color.
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Red plus green gives yellow, green plus blue gives cyan, and red plus blue gives magenta.
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Interestingly, these secondary colors become the primary colors in the subtractive synthesis.
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When we combine all the colors of additive synthesis, we get white in the center.
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It's the sum of all colors.
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As mentioned earlier, when we combine all the wavelengths of light, we perceive it as white light.
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Here we see the combination of all colors. Red and green make yellow.
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Green and blue make cyan, and blue and red make magenta.
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And the combination of all the three primary colors results in white.
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We move on to define what subtractive synthesis is.
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It's a synthesis in which the primary colors are CMY, pigment colors.
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Why is it called that?
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Because as we add colors, we subtract the colors of the substrate.
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If the substrate was white and we start adding pigment colors, that white will disappear.
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We'll talk about the colors cyan, magenta and yellow as primary colors.
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The mixture of the two primary colors will create a secondary color, which in this case
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we can see are the primary colors of additive synthesis, red, green and blue.
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As we have been discussing primary and secondary colors, let's define now what primary colors
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are.
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They are colors that cannot be obtained by mixing any other colors within their synthesis.
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Therefore, they are considered unique.
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In the case of additive synthesis, we have red, green and blue as primary colors.
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In a subtractive synthesis, we can have cyan, magenta and yellow.
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It's true that if we are designing, we can't restrict ourselves to just the primary colors,
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our design would be quite limited how do we achieve the millions of colors that we can obtain
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by mixing colors the combination of two primary colors results in a secondary color as we mentioned
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earlier when mixing rgb light colors we obtain the secondary colors cyan magenta and yellow
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which are the primaries of subtractive synthesis when mixing pigment colors
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cyan magenta and yellow we get red green and blue the mixture of pigment colors
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is referred to as subtractive because as primary colors are mixed the resulting
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color loses brightness brightness is typically provided by the white
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substrate. Now let's define tertiary colors. Tertiary colors are those obtained
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by mixing a primary color with an adjacent secondary color. When we look at
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the color wheel we will see that the adjacent secondary color is
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- Autor/es:
- Ramón Calleja
- Subido por:
- Ruth A.
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 9
- Fecha:
- 20 de mayo de 2024 - 17:38
- Visibilidad:
- Clave
- Centro:
- IES CARDENAL CISNEROS
- Duración:
- 08′ 25″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 28.12 MBytes
