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Examples for Chapter 5
p. 162, Colour DepthThis version is in 24-bit (RGB) colour. Experiment with reducing the colour depth; for example, in Photoshop, use the
Image>Mode>Indexed Color…dialogue to reduce the number of colours. Experiment with the different options.
p. 165, Indexed ColourThese two images, which are used to illustrate indexed colour in Figures 5.6, 5.8 and 5.10, are provided in 24-bit RGB colour. If you want to reproduce the effects seen in the figures, you must first convert them to indexed colour.
p. 183, ChannelsThis image is in RGB colour, which makes the channels separate cleanly as shown in Figure 5.23, because of the distinct red and green areas in the photograph. Try converting to other colour modes and looking at the individual channels (use the Channels panel in Photoshop). Lab is interesting.
p. 184, Colour CorrectionThe original photo of street musicians has a marked colour cast (as well as other defects). See if you can correct it.
p. 185, Hue and Saturation AdjustmentsThe unaltered photograph of a winter landscape for you to turn into summer, as in Figure 5.25.
p. 186, Colour ReplacementYou can find the image of a painted door, used in Figure 5.26, at the archived support site for Digital Media Tools.