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如何添加如下图所示的阴影效果？

tag-icon • tag-icon tikz-pgf graphics tcolorbox tikz-styles width
如何添加如下图所示的阴影效果？

从此代码中：

   \documentclass[12pt]{article}
    \usepackage{tikz}
    \usepackage{tikzpagenodes}
    \usetikzlibrary{arrows, shapes, positioning, shadows.blur}
    \usepackage[most]{tcolorbox}
    \usepackage[left=0.1cm, right=0.1cm, top=0.1cm, bottom=0.1cm]{geometry}
    
    \definecolor{titleBack}{RGB}{1, 28, 115}
    
    \begin{document}
    \tcbset{colback=titleBack, arc=0mm}
    \begin{tcolorbox}
    \begin{minipage}{4.5cm}
    \begin{tikzpicture}
    \clip (0, 0) circle (2cm) [blur shadow={shadow xshift=10pt, shadow yshift=-5pt, shadow blur[![This is expected image.][1]][1] radius = 1pt, shadow opacity=15}]node(Vishakha){\includegraphics[width=4cm]{rose.jpg}};
    \end{tikzpicture}
    \end{minipage}
    \end{tcolorbox}
    \end{document}

我得到：

图片 2

但我想要获得类似以下的结果：

图片 1

答案1

以下是使用迭代和通过不透明度混合颜色的一些选项。

结果：

在此处输入图片描述

梅威瑟：

\documentclass[12pt]{article} 
\usepackage{tikz}
\usepackage{duckuments}% Added for MWE implementation
\usepackage{tikzpagenodes} 
\usetikzlibrary{arrows, shapes, positioning, shadows.blur,decorations.pathmorphing} 
\usepackage[most]{tcolorbox} 
\usepackage[left=0.1cm, right=0.1cm, top=0.1cm, bottom=0.1cm]{geometry}

\definecolor{titleBack}{HTML}{203864}

\begin{document} 
    
    \tcbset{colback=titleBack} 
    
    \begin{tcolorbox} 
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}
                \foreach \x in {1,2,...,60}{
                    \fill[white, fill opacity=0.03](\x*0.015cm*rand,-\x*0.015cm*rand) circle (2cm);
                }
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}
                \foreach \x in {1,2,...,50}{
                    \pgfmathparse{0.9*rnd+0.3}
                    \definecolor{Rcolor}{rgb}{\pgfmathresult,\pgfmathresult,\pgfmathresult}
                    \fill[titleBack!50!Rcolor, fill opacity=0.05](0+\x*0.01cm*rand*rand,0-\x*0.01cm*rand*rand) circle (2cm+\x*0.005cm);
                }
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}
                \draw[blur shadow={
                    shadow blur steps=15,
                    shadow blur extra rounding=5pt, 
                    shadow xshift=5pt}] (0, 0) circle (2cm);
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        
    \end{tcolorbox} 
    
    \begin{tcolorbox} 
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}
                \foreach \x in {1,2,...,60}{
                    \fill[black!\x!white, fill opacity=0.02](\x*0.007cm,-\x*0.007cm) circle (2.1cm-\x*0.0005cm);
                }
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}[pencildraw/.style={
                    decorate,
                    decoration={random steps,segment length=4pt,amplitude=2pt}
                }
            ]
                \foreach \x in {1,2,...,20}{
                    \fill[white, fill opacity=0.02,pencildraw](0+\x*0.01cm*rand,0-\x*0.0cm*rand) circle (2cm+\x*0.02cm);
                }
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        \begin{minipage}{0.25\linewidth} 
            \begin{tikzpicture}
                \foreach \x in {0,1,2,...,20}{
                    \fill[white, fill opacity=0.2](\x*10:\x*0.1cm) circle (2.25cm-\x*0.1cm);
                }
                \clip (0, 0) circle (2cm) node(Vishakha){\includegraphics[width=8cm]{example-image-duck}}; 
            \end{tikzpicture} 
        \end{minipage}
        
    \end{tcolorbox} 
    
\end{document}

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