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Introducing the Elements of Colour

2022, Colour Literacy Forum #2, Teaching Colour Online

"Understanding and Applying Colour" was one of the first four Public Programs courses offered online by the National Art School, Sydney, beginning in June 2020. The course covers aspects of colour both specifically relevant to painters using digital or traditional media, and of more general interest to us as human beings. These aspects include the physical, biological, and psychological basis of colour perception, the attributes of perceived colour and the scales used to describe them, basic concepts of colorimetry (which come up again and again elsewhere in the course), artists' pigments and media,concepts of "colour mixture", colour and light, and the history of colour science and artistic "colour theory". David had previously given the course on campus as a five-day workshop and an evening class, both with about equal lecture and practical content. The lecture content translated readily to the online environment, but he soon realized that the best way to conduct the practical component was as optional exercises done outside of class and photographed by the student for feedback at the next session. In his presentation David will give an overview of the course and then illustrate in detail one of the practical exercises. Video recording of event: : https://www.youtube.com/watch?v=uOnI5vsstjE

Introducing the Elements of Colour Dr David J.C. Briggs Colour Literacy Forum #2, Teaching Colour Online Video recording: https://www.youtube.com/watch?v=uOnI5vsstjE Understanding and Applying Colour course outline: https://sites.google.com/site/djcbriggs/tmct Abstract Understanding and Applying Colour was one of the first four Public Programs courses offered online by the National Art School, Sydney, beginning in June 2020. The course covers aspects of colour both specifically relevant to painters using digital or traditional media, and of more general interest to us as human beings. These aspects include the physical, biological, and psychological basis of colour perception, the attributes of perceived colour and the scales used to describe them, basic concepts of colorimetry (which come up again and again elsewhere in the course), artists’ pigments and media,concepts of “colour mixture”, colour and light, and the history of colour science and artistic “colour theory”. David had previously given the course on campus as a five-day workshop and an evening class, both with about equal lecture and practical content. The lecture content translated readily to the online environment, but he soon realized that the best way to conduct the practical component was as optional exercises done outside of class and photographed by the student for feedback at the next session. In his presentation David will give an overview of the course and then illustrate in detail one of the practical exercises. My public short course "Understanding and Applying Colour" was one of the first four online courses offered by the National Art School, Sydney, beginning in June 2020. The course had previously been given on campus as a five-day workshop and evening classes, both with about 50% lecture content and 50% practical exercises. Theory The lecture component was already in the form of PowerPoints, and so translated readily to the online environment. The theory component is copiously illustrated throughout, with the aim of introducing each concept initially as a perception. Session one looks at what exactly color is a perception of, and then looks at the attributes of color perception, starting with the most familiar ones of hue, lightness (or value or tone) and chroma (or color strength) seeing how we can think of each of those as a dimension of a three-dimensional color space, and think of things like the mixing powers of paints as paths through that three-dimensional space. We also look at different scales that are used to specify those dimensions, so different hue circles like the munsell hue circle, ncs hue circle and the traditional color wheel. In session two we look at additional attributes that apply specifically to colors of light, and examines closely what we actually perceive when we look at illuminated objects. This leads on to a discussion of colorimetry or scientific color measurement, and while this is quite unusual in a course primarily for painters, concepts from colorimetry come up again and again in the rest of the course, in discussing lighting, the modern Munsell System, digital colour spaces, and visual perception. In session three we look at the biology and physiology of color vision, something that's very widely misunderstood or poorly explained in popular explanations of color vision on youtube and so on, and this leads on smoothly the various physical mixing processes known as additive mixture, subtractive mixture, additive averaging and pointillist mixture. Session Four then looks at how this theory applies to mixing processes in actual paints, studying the characteristic mixing paths we see when we mix a colored paint with a white paint, with a black paint, with a gray paint, or with paints of other hues and see how we can use this understanding to get the exact paint mixture we're after quickly and efficiently We then look at the properties of artists paints things like transparency, lightfastness, tinting strength and so on, what spectral reflectances tell us about the characteristics and mixing of different paints Session five is our first session on color and light, and we look at what happens when objects reflect and transmit light, including the zones of light and shadow, We then introduce a couple of new attributes of color saturation, which is not the same as chroma, and brilliance and show how these two concepts are important for anyone interested in in evoking in a painting effects of illumination and luminosity. Session six is our second session on color and light. We now look at what happens when we change parameters like the direction of the light, the size of the light source, the number of light sources, the material properties of the object, the effect of an intervening atmosphere, and the effect of colored illumination. We then explore how the visual system adapts to the color of of the illumination, and related visual phenomena such as coloured shadows and afterimages. In session seven we look at the psychological aspects of color vision and explore the many aspects of visual perception that are relevant to painters. in particular color constancy, our capacity to see an object as having a relatively consistent color, how this is important to us for getting around in the world but something that can create problems for us as painters. We then look at some failures of color constancy that are also important to us as painters especially simultaneous contrast and assimilation. In our final session, called theories of color, we review the subject from a historical point of view. looking in particular at the foundations laid by Leonardo in the applied science of depicting visual appearances, and the development of our current understanding of the “anatomy” of colour, and how this relates to the tenets of traditional “artistic” (red-yellowblue) colour theory. Practical It was soon realized that the best way to conduct the practical component was as optional "homework" exercises based on instructions given at the end of each session. Students who wished to could email in photos of their homework for feedback during the first 30 minutes of the next session. The change has had two positive outcomes: more time is now available for the lecture content, and the students, not all of who want to undertake practical painting, can spend as much or as little time as they want on the practical exercises, instead of everyone being stuck with fixed three-hour sessions. The exercises progress from quite basic exercises complementing the theory through to simple studies looking at how to apply these concepts to a painting. Students prepare sequences of paint mixtures on canvas or board illustrating the intermediate colour steps that can be obtained from various combinations of components, including • Mixing a transparent coloured paint (e.g. ultramarine, permanent rose) with white paint. • Mixing opaque coloured paint (e.g. lemon yellow) with white paint. • Thinning a transparent coloured paint over a white ground. • Mixing two paint mixtures of the same lightness (greyscale value). • Mixing black paint progressively with a tint (colorant paint + white paint mixture). • Mixing three coloured paints in pairs, arranged as a circle or triangle. Ideally the colours of the mixtures should progress in approximately even perceptual steps, so that the complete mixing path is represented. The paint surfaces should be flat as possible i.e. not entirely disturbed by brush marks or the weave of the canvas. Students photograph each sequence, aiming for even illumination across whole sequence, and avoiding highlights and excessively raking lighting as much as possible. Teacher opens submitted photographs in Image J and analyses in CIE L*a*b* using the Color Inspector 3D plugin, wherever possible relating details of three dimensional mixing path to observed colour attributes.