Optical mixture is one of the color theories. It states that when two colors are perceived simultaneously, they could be seen as combined and merged into one new color. In other words, colors are mixed in our perception, not on the canvas. The value of a color varies with its combination with other colors. This technique has been widely used by impressionists. Instead of mixing blue and yellow color physically, the artist would paint the two colors next to each other so that the audience will perceive the color green in their mind. This would work better with distant view because colors are mixed, at a distance in our eyes.
Another side of this phenomenon is that the change of one single color can modify the color combinations of the entire design. It can alter the light and weight of the original design and sometimes it even changes the emotion. When white is added to the image, it tends to be lighter and this happen vice versa with black color. This incident is called the Bezold Effect. For example, the picture below shows the combination of white and black color on one design. The altering backgrounds grab the audience’s attention and emphasize the picture’s meaning. If the background were all black, the emotion and meaning of the color would be different. This shows the impact of the Bezold Effect on designs.
pictures taken from:
http://fineartamerica.com/images-medium/flower-painting-impressionism-flower--original-art-by-impressionism-oil-painting-artist-rybakow-valery-rybakow.jpg
http://imagecache5.art.com/p/LRG/16/1686/4L61D00Z/ginette-callaway-monets-bridge--impressionism-by-ginette.jpg
http://www.filecluster.com/screenshots/87479.jpg
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