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-\documentclass{article}
-\usepackage{amsmath}
-\usepackage{graphicx}
-\usepackage{array,longtable}
-
-\begin{document}
-
-\noindent The following list of blend modes is taken verbatim from section
-7.2.4 of the \textsl{PDF Reference}, Sixth Edition (Version 1.7).
-
-\noindent\hfill\begin{longtable}{>{\ttfamily}lp{3.5in}}
-Normal & Selects the source color, ignoring the backdrop.
-% $$B(c_b,c_s)=c_s$$
-\\[3pt]
-Multiply & Multiplies the backdrop and source color values: The
- result color is always at least as dark as either of the two
- constituent colors. Multiplying any color with black produces black;
- multiplying with white leaves the original color unchanged. Painting
- successive overlapping objects with a color other than black or
- white produces progressively darker colors.
-% $$B(c_b,c_s)=c_b\times c_s$$
-\\[3pt]
-
-Screen & Multiplies the complements of the backdrop and source
- color values, then complements the result: The result color is
- always at least as light as either of the two constituent colors.
- Screening any color with white produces white; screening with black
- leaves the original color unchanged. The effect is similar to
- projecting multiple photographic slides simultaneously onto a single
- screen.
-% $$
-% B(c_b,c_s) = 1 - [ (1 - c_b) \times (1 - c_s) ]
-% = c_b + c_s - (c_b\times c_s)
-% $$
-\\[3pt]
-Overlay & Multiplies or screens the colors, depending on the
- backdrop color value. Source colors overlay the backdrop while
- preserving its highlights and shadows. The backdrop color is not
- replaced but is mixed with the source color to reflect the lightness
- or darkness of the backdrop.
-% $$B(c_b,c_s)=\operatorname{HardLight}(c_b,c_s)$$
-\\[3pt]
-
-Darken & Selects the darker of the backdrop and source colors:
- The backdrop is replaced with the source where the
- source is darker; otherwise, it is left unchanged.
-% $$B(c_b,c_s)=\min(c_b,c_s)$$
-\\[3pt]
-
-Lighten & Selects the lighter of the backdrop and source colors:
- The backdrop is replaced with the source where the
- source is lighter; otherwise, it is left unchanged.
-% $$B(c_b,c_s)=\max(c_b,c_s)$$
-\\[3pt]
-
-ColorDodge &Brightens the backdrop color to reflect the source
- color. Painting with black produces no changes.
-% $$
-% B(c_b,c_s)=\begin{cases}
-% \min(1,c_b/(1-c_s)) & \text{if $ c_s < 1$}\\[3pt]
-% 1 & c_s = 1
-% \end{cases}
-% $$
-\\[3pt]
-
-ColorBurn & Darkens the backdrop color to reflect the source color.
- Painting with white produces no change.
-% $$
-% B(c_b,c_s)=\begin{cases}
-% \min(1,(1-c_b)/c_s) & \text{if $ c_s > 0$}\\[3pt]
-% 0 & c_s = 0
-% \end{cases}
-% $$
-\\[3pt]
-
-
-HardLight & Multiplies or screens the colors, depending on the
- source color value. The effect is similar to shining a harsh
- spotlight on the backdrop.
-% $$
-% B(c_b,c_s)=\begin{cases}
-% \operatorname{Multiply}(c_b,2\times c_s) & \text{if $ c_s \le 0.5$}\\[3pt]
-% \operatorname{Screen}(c_b,2\times c_s -1) & c_s > 0.5
-% \end{cases}
-% $$
-\\[3pt]
-
-SoftLight & Darkens or lightens the colors, depending on the source
- color value. The effect is similar to shining a diffused spotlight
- on the backdrop.
-% $$
-% B(c_b,c_s)=\begin{cases}
-% c_b - (1 - 2\times c_s)\times c_b\times (1-c_b) & \text{if $ c_s < 0.5$}\\[3pt]
-% c_b + (2 \times c_s - 1) \times (\operatorname{D}(c_b)-c_b) & c_s > 0.5
-% \end{cases}
-% $$
-% where
-% $$
-% D(x)=\begin{cases}
-% ((16\times x -12) \times x + 4) \times x & \text{if $ x < 0.25$}\\[3pt]
-% \sqrt{x} & c_s > 0.25
-% \end{cases}
-% $$
-\\[3pt]
-
-Difference &Subtracts the darker of the two constituent colors from
- the lighter color: Painting with white inverts the backdrop color;
- painting with black produces no change.
-% $$
-% B(c_b,c_s) = | c_b - c_s |
-% $$
-\\[3pt]
-
-Exclusion & Produces an effect similar to that of the \texttt{Difference}
- mode but lower in contrast. Painting with white inverts the backdrop
- color; painting with black produces no change.
-% $$
-% B(c_b,c_s) = c_b + c_s - 2\times c_b \times c_s
-% $$
-\\[3pt]
-Hue & Creates a color with the hue of the source color and the
- saturation and luminosity of the backdrop color.
-% $$
-% B(C_b,C_s)=\operatorname{SetLum}(\operatorname{SetSat}(C_s,\operatorname{Sat}(C_b)),\operatorname{Lum}(C_b))
-% $$
-\\[3pt]
-
-Saturation & Creates a color with the saturation of the source color
- and the hue and luminosity of the backdrop color. Painting with this
- mode in an area of the backdrop that is a pure gray (no saturation)
- produces no change.
-% $$
-% B(C_b,C_s)=\operatorname{SetLum}(\operatorname{SetSat}(C_b,\operatorname{Sat}(C_s)),\operatorname{Lum}(C_b))
-% $$
-\\[3pt]
-
-Color & Creates a color with the hue and saturation of the source
- color and the luminosity of the backdrop color. This preserves the
- gray levels of the backdrop and is useful for coloring monochrome
- images or tinting color images.
-% $$
-% B(C_b,C_s)=\operatorname{SetLum}(C_s,\operatorname{Lum}(C_b))
-% $$
-\\[3pt]
-Luminosity & Creates a color with the luminosity of the source color
- and the hue and saturation of the backdrop color. This produces an
- inverse effect to that of the \texttt{Color} mode.
-% $$
-% B(C_b,C_s)=\operatorname{SetLum}(C_b,\operatorname{Lum}(C_s))
-% $$
-\\[3pt]
-\end{longtable}
-\end{document}