A field guide to digital color by Maureen Stone

By Maureen Stone

Annotation Maureen Stone's box advisor to electronic colour offers a survey of electronic colour with designated emphasis on these fields very important for special effects. The booklet offers the root for knowing colour and its purposes, discusses colour media and colour administration and using colour in special effects, together with colour layout and choice. The publication presents a advisor for somebody who desires to  Read more...

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A dim surround is typical for television and monitor viewing, a dark surround for movies and slides. Each requires increasing the contrast, as shown in the figure, to achieve the same overall appearance as the original. These results are part of the practice in professional image reproduction industries such as television and graphic arts, and are encoded in some form in most color appearance models. Figure 18. Bartelson and Breneman recommendations for increasing contrast as a function of surround.

In the bands of alternating bars shown in Figure 13, exactly the same two colors are used. The difference Figure 13. in appearance is entirely due to the difference in spatial frequency. The colors in the two patterns are identical. Only the spatial frequency is different, which changes their appearance. 33 A Field Guide to Digital Color Adaptation Human vision is very adaptable. We are capable of seeing in both very dim and very bright light, and over six orders of magnitude from the dimmest starlight to full sunlight.

While it appears to show a monotonically decreasing set of gray steps, black and white again have the same brightness. The appearance of colors in the real world differs from the simple models defined by the retina due to a combination of perceptual and cognitive effects. The perceptual effects are created by the encoding and processing of the original retinal signals, which is more complex than the simple RGB encoding described so far. Cognitive effects are based on our knowledge of how objects and lights behave in the world.

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