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高斯（或类似）模糊可以应用于 Tikz 文本吗？

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高斯（或类似）模糊可以应用于 Tikz 文本吗？

我正在尝试在 Ti 中模拟钾Z 是我之前用 SVG 绘制的标题页。下图来自 SVG 版本，其中阴影文本是使用feGaussianBlur。但我在 Ti 上找到的所有关于滤镜和阴影等内容钾Z 似乎不适用于文本。

有没有什么办法可以达到这个结果？

当前代码（从 SVG 手动翻译并适应我的书布局）：

\documentclass[11pt,extrafontsizes]{memoir}

\setstocksize{9in}{6in}
\settrimmedsize{\stockheight}{\stockwidth}{*}
\medievalpage[12]
\checkandfixthelayout

%\usepackage{fontspec}
%\newfontfamily\gingerfont{RM Ginger}
%\newcommand*{\ginger}[1]{\gingerfont\fontsize{#1}{#1}\selectfont}
\newcommand*{\ginger}[1]{\normalfont\fontsize{#1}{#1}\selectfont}

\usepackage{tikz}
\usepackage{tikzpagenodes}
\usetikzlibrary{calc,positioning,decorations.text}
\tikzset{x=1in,y=1in}

\begin{document}
\thispagestyle{empty}
\begin{tikzpicture}[remember picture,overlay,shift={($ (current page.south west) + (0.5, 0.5) $)}]

  \node at (2.5, 7) [font=\ginger{31.5}, anchor=base] {Unshadowed Text};

  \draw[shift={(0, 5.75)}, decorate,
      decoration={text along path, text align=center,
      text={|\ginger{40.5}|The Long Title}}]
    (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
      .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

  \node at (2.5, 6.125) [font=\ginger{31.5}, anchor=base] {of};

  \draw[shift={(0, 5)}, decorate,
      decoration={text along path, text align=center,
      text={|\ginger{81}|the Book}}]
    (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
      .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

  \node at (2.5, 4.25) [font=\ginger{47.25}, anchor=base] {A. U. Thor};

  \node at (2.5, 3) [font=\ginger{31.5}, anchor=base] {More unshadowed text};

  \node at (2.5, 2.5) [font=\ginger{27}, anchor=base] {and some more};
\end{tikzpicture}
\end{document}

SVG 版本的样子：带有 SVG 模糊效果的标题页示例

答案1

我想我的回答可能有点晚了，但我还是给出了答案。谁知道呢？

一些模糊的文字

我尝试使用双环来产生模糊效果；考虑一个字母，环会将其循环向外移动。

功能用于模糊尝试使模糊效果的大小适应字母的大小。还应考虑普通字体与粗体字体...

我尝试遵循你的代码。由于你使用了沿路径的文本装饰，为了能够处理不透明度，必须传递到沿路径的文字效果相应地。我在代码的模糊部分（第一部分）做了这个。

如果您保留以下参数，编译将需要一些耐心。

\documentclass[11pt, extrafontsizes]{memoir}

\newcommand*{\ginger}[1]{\normalfont\fontsize{#1}{#1}\selectfont}
\newcommand*{\bfginger}[1]{\bfseries\fontsize{#1}{#1}\selectfont}

\usepackage{xcolor}
\colorlet{blurColor}{black!75}

\usepackage{tikz}
\usetikzlibrary{math, calc, positioning, decorations.text}
\tikzset{x=1in, y=1in}

\begin{document}
\thispagestyle{empty}

\tikzmath{%
  integer \N;
  \N = 17; % 23;
  real \op, \tmp;
  \op = .025;
  function forBlurring(\i, \s) {
    return \i*\s/61;
  };
}
\begin{tikzpicture}[]
  \foreach \i in {.1, .3, .45, .6, .8}{%
    \foreach \j in {0, ..., \N}{%
      \tikzmath{ \tmp = forBlurring(\i, 41); }
      \path[shift={($(0, 5.25)+({\j/(\N+1)*360} : \tmp ex)$)}, decorate,
      decoration={%
        text effects along path, text align=center,
        text={The Long Title},
        text effects/.cd,
        characters={text along path, blurColor,
          opacity=\op, font=\bfginger{41}}
      }]
      (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
      .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

      \node[font=\bfginger{41}, anchor=base, blurColor, opacity=\op]
      at ($(2.5, 5.15)+({\j/(\N+1)*360} : \tmp ex)$) {of};

      \tikzmath{ \tmp = forBlurring(\i, 61); }
      \path[shift={($(0, 3.5)+({\j/(\N+1)*360} : \tmp ex)$)}, decorate, 
      decoration={%
        text effects along path, text align=center,
        text={the Book},
        text effects/.cd,
        characters={text along path, blurColor,
          opacity=\op, font=\bfginger{61}}
      }]
      (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
      .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

      \tikzmath{ \tmp = forBlurring(\i, 47); }
      \node[font=\ginger{47}, anchor=base, blurColor, opacity=\op]
      at ($(2.5, 2.5)+({\j/(\N+1)*360} : \tmp ex)$) {A. U. Thor};     
    }
  }
  
  \node at (2.5, 7) [font=\ginger{31}, anchor=base] {Unshadowed Text};

  \draw[shift={(0, 5.25)}, decorate,
  decoration={%
    text along path, text align=center,
    text={|\bfginger{41}|The Long Title}
  }]
  (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
  .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

  \node at (2.5, 5.15) [font=\bfginger{41}, anchor=base] {of};
  
  \draw[shift={(0, 3.5)}, decorate, 
  decoration={%
    text along path, text align=center,
    text={|\bfginger{61}|the Book}
  }]
  (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
  .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);

  \node at (2.5, 2.5) [font=\ginger{47.25}, anchor=base] {A. U. Thor};

  \node at (2.5, 1.25) [font=\ginger{28}, anchor=base]
  {More unshadowed text};

  \node at (2.5, .75) [font=\ginger{28}, anchor=base]
  {and some more};
\end{tikzpicture}

答案2

也许不那么黑客化：

将文本渲染模式（PDF 操作符Tr）设置为2“填充和描边”（正常0= 仅填充），然后逐渐减小线宽和描边颜色（从白色到黑色），同时多次叠加文本。请注意，文本是不是移动以产生模糊。

模糊效果的强度取决于用于描画字形轮廓的初始线宽：线宽越大，强度越大。此示例可以扩展为对不同字体大小使用不同的值。

是的，不要忘记将图形状态参数“线连接”设置为1，意思是“圆形”，以避免出现尖角。 在此处输入图片描述

\documentclass[11pt,extrafontsizes,oneside]{memoir}

\newcommand*{\ginger}[1]{\normalfont\fontsize{#1}{#1}\selectfont}
\newcommand*{\bfginger}[1]{\bfseries\fontsize{#1}{#1}\selectfont}

\usepackage{tikz}
\usetikzlibrary{calc,decorations.text}
\tikzset{x=1in,y=1in}

\begin{document}\thispagestyle{empty}
\begin{center}
\begin{tikzpicture}
  \node at (2.5, 7) [font=\ginger{32}, anchor=base] {Unshadowed Text};
  
  \foreach \i in {0,1,...,100} {
    \pgfmathsetmacro{\lw}{8.0-\i*0.08} % line width
    \pgfmathsetmacro{\lc}{1.0-\i*0.01} % stroke colour
    \pdfliteral{q          % save graphics state
      1 j                  % line join "Round"
      \lw\space w          % line width
      2 Tr}                % text render mode: fill & stroke
      \path[shift={(0, 5.25)}, decorate,
          decoration={text along path, text align=center,
          text={|\bfginger{40}\pdfliteral{\lc\space G}|The Long Title}}]
        (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
          .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);
    
      \node at (2.5, 5.18) [font=\bfginger{32}, anchor=base] {\pdfliteral{\lc\space G}of};
    
      \path[shift={(0, 3.5)}, decorate,
          decoration={text along path, text align=center,
          text={|\bfginger{60}\pdfliteral{\lc\space G}|the Book}}]
        (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
          .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);
    \pdfliteral{Q}         % restore graphics state
  }  
  
  \node at (2.5, 2.5) [font=\ginger{46}, anchor=base] {A. U. Thor};
  
  \node at (2.5, 1.25) [font=\ginger{32}, anchor=base] {More unshadowed text};
  
  \node at (2.5, 0.75) [font=\ginger{32}, anchor=base] {and some more};
\end{tikzpicture}
\end{center}
\end{document}

这是一个略微改进的例子。我们不直接排版标题页，而是创建一个不透明度蒙版（淡入淡出，在 Ti钾Z 的说法）几乎与上述方法相同。（唯一的区别是：我们将颜色从黑色变为白色，因为黑色蒙版区域完全透明，白色区域完全不透明。）此不透明蒙版允许我们组合任意背景和前景色。

在此处输入图片描述

\documentclass[11pt,extrafontsizes,oneside]{memoir}

\newcommand*{\ginger}[1]{\normalfont\fontsize{#1}{#1}\selectfont}
\newcommand*{\bfginger}[1]{\bfseries\fontsize{#1}{#1}\selectfont}

\usepackage{tikz}
\usetikzlibrary{calc,decorations.text}
\tikzset{x=1in,y=1in}

\pagestyle{empty}

\begin{document}
\pgfdeclarefading{titlemask}{%
  \begin{tikzpicture}[text=white,/pgf/decoration/text color=white] % default text colour --> fully opaque
    \node at (2.5, 7) [font=\ginger{32}, anchor=base] {Unshadowed Text};
    \foreach \i in {0,1,...,100} {
      \pgfmathsetmacro{\lw}{8.0-\i*0.08} % line width
      \pgfmathsetmacro{\lc}{\i*0.01} % stroke colour
      \pdfliteral{q          % save graphics state
        1 j                  % line join "Round"
        \lw\space w          % line width
        2 Tr}                % text render mode: fill & stroke
        \path[shift={(0, 5.25)}, decorate,
            decoration={text along path, text align=center,
            text={|\bfginger{40}\pdfliteral{\lc\space G}|The Long Title}}]
          (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
            .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);
        \node at (2.5, 5.18) [font=\bfginger{32}, anchor=base] {\pdfliteral{\lc\space G}of};
        \path[shift={(0, 3.5)}, decorate,
            decoration={text along path, text align=center,
            text={|\bfginger{60}\pdfliteral{\lc\space G}|the Book}}]
          (0, 0) .. controls (1, 0.5) and (1.625, 0.625) .. (2.5, 0.625)
            .. controls (3.375, 0.625) and (4, 0.5) .. (5, 0);
      \pdfliteral{Q}         % restore graphics state
    }  
    \node at (2.5, 2.5) [font=\ginger{46}, anchor=base] {A. U. Thor};
    \node at (2.5, 1.25) [font=\ginger{32}, anchor=base] {More unshadowed text};
    \node at (2.5, 0.75) [font=\ginger{32}, anchor=base] {and some more};
    % save corners and centre of the mask
    \pgfpointanchor{current bounding box}{south west}
    \pgfgetlastxy{\maskllx}{\masklly}\xdef\maskll{\maskllx,\masklly}
    \pgfpointanchor{current bounding box}{north east}
    \pgfgetlastxy{\maskurx}{\maskury}\xdef\maskur{\maskurx,\maskury}
    \pgfpointanchor{current bounding box}{center}
    \pgfgetlastxy{\maskcx}{\maskcy}\xdef\maskc{\maskcx,\maskcy}
  \end{tikzpicture}%
}

\begin{center}
\begin{tikzpicture}
\fill[scope fading=titlemask, fit fading=false,  % install mask on black rectangle
        fading transform={shift={(\maskc)}}] (\maskll) rectangle (\maskur);
\end{tikzpicture}
\end{center}

\newpage\pagecolor{yellow!10}

\begin{center}
\begin{tikzpicture}
\fill[scope fading=titlemask, fit fading=false, fill=red!80!black, % ditto, but red rectangle
        fading transform={shift={(\maskc)}}] (\maskll) rectangle (\maskur);
\end{tikzpicture}
\end{center}
\end{document}

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