By Maureen Stone

ISBN-10: 1568811616

ISBN-13: 9781568811611

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

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Extra resources for A field guide to digital color

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Stare at the black dot for about a minute, then look at a white surface to see the afterimages. Lightness Scales Lightness, brightness, intensity, luminance and L* are all ways of arranging a set of colors along a scale from dark to light. As the control of this mapping is key to many color imaging applications, it is important to understand what these quantities mean and how they relate to the perception of color. Lightness and brightness are qualitative terms, with no specific measurement associated with them.

The cube root function is replaced by a linear one, scaled and offset so that the slopes will match whenever the Equations for CIE 1976 L , a , b (CIELAB) „ ^w W 1/3 Y 16 L = 116  Yn 116 ^w a = 500 ^w b = 200 X Xn Y Yn w W1/3  w W1/3  Y Yn Z Zn W1/3 „ W1/3 „ Xn , Yn , Zn are the tristimulus values of the reference white. 787 + in the equations above. Vn Vn 116 If Equations for Hue (hab ) and Chroma (Cab ) w W =1/2  b 2 2 hab = arctan = a + b C ab a Figure 4. The mathematics of CIELAB, including the basic equations plus the specification for hue and chroma.

The more blue the light, the less sensitive the blue cone, and vice versa. The process is summarized in Figure 17, where X, Y, and Z are tristimulus values; L, M, S are cone responses; and A is a matrix that transforms between them. Given a set of tristimulus values that define the old (Lw1, Mw1, Sw1) and new (Lw2, Mw2, Sw2) values of white, first use a matrix multiplication to convert from tristimulus values to cone response values. Then, compute the ratios in LMS space and convert back to tristimulus space using the inverse of the XYZ to LMS matrix.

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