How to remove parts of image based on tikzpicture shape behind it?

Question

I am trying to remove parts of my image so it looks like it is inside of a shape (tikzpicture). I don't have an idea how to do it, I guess that my LaTeX code (see below) has to be thought over.

This is my output right now: And this is how it should look like: This is my LaTeX Code:

\documentclass[a4paper,12pt,oneside]{scrreprt}
\usepackage{tikz}
\usepackage{xcolor}
\usepackage{graphicx}

\begin{document}

\clearpage
\vspace*{-2.5cm}

\begin{tikzpicture}[remember picture,overlay]
\fill[color = red] (-3.5cm, -0.5cm) node{}
-- (-3cm,-5cm) node{}
-- (\paperwidth,-6cm) node{}
-- (\paperwidth,0.5cm) node{};
\end{tikzpicture}

\begin{minipage}[ht]{0.28\textwidth}
    \begin{tikzpicture}
    \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[width=0.29\paperwidth]{Test}};
    \end{tikzpicture}
\end{minipage}

\end{document}

Thanks in advance for any help!

Now if you really want to be fancy, store the coordinates of the corners and use a graphics editor (like Gimp) to apply a perspective transformation. See https://tex.stackexchange.com/questions/312238/how-to-create-a-tikz-picture-with-a-non-infinite-distance-viewpoint/312959?r=SearchResults&s=1|21.9088#312959 — John Kormylo, Apr 26 '20 at 17:43
The perspective solution is interesting. Thanks for your comment, John! — owmal, Apr 26 '20 at 19:12

BambOo · Accepted Answer · 2020-04-26T14:05:36.427

5

Here is a working example of what you could do with a clip and a preaction to fill the clipped area

\documentclass[tikz]{standalone}
\usepackage{xcolor}
\usepackage{graphicx}

\begin{document}
    % Without clip
    \begin{tikzpicture}
        \path[preaction={fill=red}] (0,-2) -- (5,-4) -- (5,4) -- (0,2) -- cycle;
    \node[inner sep=0] (image) at (2,0) {\includegraphics[scale=0.75]{example-image-a}};
    \end{tikzpicture}
    % With clip
    \begin{tikzpicture}
        \path[clip,preaction={fill=red}] (0,-2) -- (5,-4) -- (5,4) -- (0,2) -- cycle;
    \node[inner sep=0] (image) at (2,0) {\includegraphics[scale=0.75]{example-image-a}};
    \end{tikzpicture}

\end{document}

Without clip

With clip

edited Apr 26 '20 at 14:05

answered Apr 26 '20 at 13:50

BambOo

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Very nice, just what I've been looking for. Thank you! (Y) – owmal Apr 26 '20 at 14:05
@owmal you are welcome ! – BambOo Apr 26 '20 at 14:05

score 0 · Answer 2 · answered Apr 28 '20 at 15:43

Update: based on BambOo's answer, I've updated the code above to be suited for my example. It looks just like what I've wanted to create. Here is the new code, if that helps anyone:

\documentclass[a4paper,12pt,oneside]{scrreprt}
\usepackage{tikz}
\usepackage{xcolor}
\usepackage{graphicx}

\begin{document}

\clearpage
\vspace*{-2.5cm}

\hspace*{-3.5cm}\begin{tikzpicture}
\path[clip,preaction={fill=red}] (-3.5,-0.5) -- (-3.5,-5) -- (\paperwidth,-6) -- (\paperwidth,0.5) -- cycle;
\node[inner sep=0] (image) at (3,-3) {\includegraphics[scale=0.65]{Test}};
\end{tikzpicture}

\end{document}

How to remove parts of image based on tikzpicture shape behind it?

2 Answers2