Graphics, Figures & TablesHow to add a shadow under a picture ?

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Stefan Kottwitz
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Re: How to add a shadow under a picture ?

Post by Stefan Kottwitz »

I would define a macro for that, in the preamble. Within the figure environment, I would call that macro. So further changes or adjustments would be easy and consistent.

Stefan
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Cham
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Joined: Sat Apr 02, 2011 4:06 pm

Re: How to add a shadow under a picture ?

Post by Cham »

Hmm, I'm ain't an expert on this. How do you suggest to define that macro ?
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Stefan Kottwitz
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How to add a shadow under a picture ?

Post by Stefan Kottwitz »

Macros are an important strength of LaTeX. Define a macro once, and use it many times. For example, in the preamble:

Code: Select all

Code, edit and compile here:
\newcommand{\shadowpicture}[1]{%
\shadowsize=1pt
\fboxrule=0pt
\fboxsep=0pt
\color{gray}
\shadowbox{\fboxsep=6pt\fcolorbox{white}{white}{#1}}
\normalcolor
}
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Later, in the document:

Code: Select all

Code, edit and compile here:
\begin{figure}[H]
\centering
\shadowpicture{\includegraphics[height=8cm]{picture.jpg}}
\caption{Another caption.}
\end{figure}
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Macros are not just for saving typing, but for consistency and easy changes.

Stefan
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Cham
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Re: How to add a shadow under a picture ?

Post by Cham »

Works perfectly well ! :D

Thanks Stefan ! (by the way, see the preview in my last message, on the previous page...)
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Stefan Kottwitz
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How to add a shadow under a picture ?

Post by Stefan Kottwitz »

The preview looks nice!

Regarding macros, try defining macros for all which you possibly need several times, also to make a logical document. For example, I would not even use \textbf or \textit in a document - but I would define \keyword etc. for such emphasis. These macros could call \textbf etc. And I could change that for the whole document whenever I like.

Stefan
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bloomy
Posts: 2
Joined: Thu Mar 20, 2014 12:44 am

How to add a shadow under a picture ?

Post by bloomy »

I found a very nice solution on http://tex.stackexchange.com/questions/ ... ssian-blur

It certainly looks like its exactly what you are looking for, and I was also. Next thing is I'd like to make this part of a class or a module.

Let me know how you go.
Cheers


Here is the code

Code: Select all

Code, edit and compile here:
\documentclass{article}
% put all this in the preamble
\usepackage{tikz}
\usetikzlibrary{shadows,calc}
% code adapted from http://tex.stackexchange.com/a/11483/3954
% some parameters for customization
\def\shadowshift{3pt,-3pt}
\def\shadowradius{6pt}
\colorlet{innercolor}{black!60}
\colorlet{outercolor}{gray!05}
% this draws a shadow under a rectangle node
\newcommand\drawshadow[1]{
\begin{pgfonlayer}{shadow}
\shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.south west)+(\shadowshift)+(\shadowradius/2,\shadowradius/2)$) circle (\shadowradius);
\shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) circle (\shadowradius);
\shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) circle (\shadowradius);
\shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.north east)+(\shadowshift)+(-\shadowradius/2,-\shadowradius/2)$) circle (\shadowradius);
\shade[top color=innercolor,bottom color=outercolor] ($(#1.south west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) rectangle ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$);
\shade[left color=innercolor,right color=outercolor] ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$);
\shade[bottom color=innercolor,top color=outercolor] ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$);
\shade[outercolor,right color=innercolor,left color=outercolor] ($(#1.south west)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$);
\filldraw ($(#1.south west)+(\shadowshift)+(\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)-(\shadowradius/2,\shadowradius/2)$);
\end{pgfonlayer}
}
% create a shadow layer, so that we don't need to worry about overdrawing other things
\pgfdeclarelayer{shadow}
\pgfsetlayers{shadow,main}
\newcommand\shadowimage[2][]{%
\begin{tikzpicture}
\node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[#1]{#2}};
\drawshadow{image}
\end{tikzpicture}}
% end of the preamble stuff
 
 
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Stef Pillaert
Posts: 51
Joined: Sat Oct 22, 2016 3:43 pm

How to add a shadow under a picture ?

Post by Stef Pillaert »

This looks great! Can this also be used somehow to have the same effect on a box filled with text (minipage)?
Stef
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