给圆形图像添加圆形边框

Question

\documentclass[11pt,a4paper]{report}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage[left=3.00cm, right=3.00cm, top=3.00cm, bottom=3.00cm]{geometry}
\usepackage{blindtext}

%%Color/Tikz
\usepackage{xcolor}
\definecolor{myRed}{HTML}{ff6347}
\definecolor{myOrange}{rgb}{1,0.5,0}

\usepackage{tikz}
\usepackage{float}

\begin{document}

\begin{tikzpicture}
\node[anchor=south west,inner sep=0] at (.15\columnwidth,0) {\includegraphics[width=.7\columnwidth]{froggy}};
\draw[black,ultra thick,rounded corners] (7.5,5.3) circle (.35\columnwidth);
\end{tikzpicture}

\end{document}

虽然它在某种程度上“有效”，但并不完美。有人能帮我吗？这是我做错的部分：

\begin{tikzpicture}
\node[anchor=south west,inner sep=0] at (.15\columnwidth,0) {\includegraphics[width=.7\columnwidth]{froggy}};
\draw[black,ultra thick,rounded corners] (7.5,5.3) circle (.35\columnwidth);
\end{tikzpicture}

问题：边框几乎正确覆盖了图像。但是左上角和左下角有 1 毫米左右的空白。这个小东西让我抓狂。

图像问题

1

2

Answer 1

skins库中添加了允许使用定义的图像或图片填充路径 tcolorbox的选项：TikZ

\documentclass[11pt,a4paper]{report}

\usepackage{tikz}
\usepackage[skins]{tcolorbox}

\begin{document}

\begin{tikzpicture}
\draw[black,ultra thick,fill zoom image=frog] (7.5,5.3) circle (.35\columnwidth);
\end{tikzpicture}

\begin{tikzpicture}
\draw[black,ultra thick,fill zoom image=frog, rounded corners] (0,0)--(45:3cm)-|++(3,-5)--cycle;
\end{tikzpicture}
\end{document}

Answer 2

我没有完全理解你的问题，因为我没有图片froggy。在这里我删除了未使用的代码并替换froggy为example-image-a。通过制作outer sep=0并从圆直径中减去线宽，它完美地覆盖了图像：

\documentclass{article}
\usepackage{graphicx}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\node[anchor=south west, inner sep=0, outer sep=0] at (0, 0) {\includegraphics[width=.7\columnwidth]{example-image-a}};
\draw[ultra thick] (.35\columnwidth, .35\columnwidth) circle (.35\columnwidth-0.5\pgflinewidth);
\end{tikzpicture}
\end{document}