Color Space: Special Considerations in Java

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Conceptually, a shading determines a color value for each individual point within the area to be painted In practice, however, the shading may actually be used to compute color values only for some subset of the points in the target area, with the colors of the intervening points determined by interpolation between the ones computed Viewer applications are free to use this strategy as long as the interpolated color values approximate those de ned by the shading to within the smoothness tolerance speci ed in the graphics state (see Section 652, Smoothness Tolerance ) The ColorSpace entry common to all shading dictionaries not only de nes the color space in which the shading speci es its color values, but also determines the color space in which color interpolation is performed Note: Some shading types (4 to 7) perform interpolation on a parametric value supplied as input to the shading s color function, as described in the relevant sections below This form of interpolation is conceptually distinct from the interpolation described here, which operates on the output color values produced by the color function and takes place within the shading s target color space Gradient lls between colors de ned by most shadings are implemented using a variety of interpolation algorithms, and these algorithms are sensitive to the characteristics of the color space Linear interpolation, for example, may have observably different results when applied in a DeviceCMYK color space than in a Lab color space, even if the starting and ending colors are perceptually identical The
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difference arises because the two color spaces are not linear relative to each other Shadings are rendered according to the following rules:
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If ColorSpace is a device color space different from the native color space of the
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output device, color values in the shading will be converted to the native color space using the standard conversion formulas described in Section 62, Conversions among Device Color Spaces To optimize performance, these conversions may take place at any time (either before or after any interpolation on the color values in the shading) Thus, shadings de ned with device color spaces may have color gradient lls that are less accurate and somewhat devicedependent (This does not apply to axial and radial shadings shading types 2 and 3 because those shading types perform gradient ll calculations on a single variable and then convert to parametric colors)
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If ColorSpace is a CIE-based color space, all gradient ll calculations will be
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performed in that space Conversion to device colors will occur only after all interpolation calculations have been performed Thus, the color gradients will be device-independent for the colors generated at each point
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If ColorSpace is a Separation or DeviceN color space and the speci ed colorants are supported, no color conversion calculations are needed If the speci ed colorants are not supported (so that the space s alternate color space must be used), gradient ll calculations will be performed in the designated Separation or DeviceN color space before conversion to the alternate space Thus, nonlinear tint transformation functions will be accommodated for the best possible representation of the shading
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If ColorSpace is an Indexed color space, all color values speci ed in the shading
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will be immediately converted to the base color space Depending on whether the base color space is a device or CIE-based space, gradient ll calculations will be performed as stated above Interpolation never occurs in an Indexed color space, which is quantized and therefore inappropriate for calculations that assume a continuous range of colors For similar reasons, an Indexed color space is not allowed in any shading whose color values are generated by a function; this applies to any shading dictionary that contains a Function entry
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Shading Types
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In addition to the entries listed in Table 425 on page 234, all shading dictionaries have entries speci c to the type of shading they represent, as indicated by the
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