## LaTeX forum ⇒ Graphics, Figures & Tables ⇒ How to add a shadow under a picture ? Topic is solved

Information and discussion about graphics, figures & tables in LaTeX documents.
Stefan Kottwitz
Posts: 8946
Joined: Mon Mar 10, 2008 9:44 pm

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

Cham
Posts: 885
Joined: Sat Apr 02, 2011 4:06 pm
Hmm, I'm ain't an expert on this. How do you suggest to define that macro ?

Stefan Kottwitz
Posts: 8946
Joined: Mon Mar 10, 2008 9:44 pm
Macros are an important strength of LaTeX. Define a macro once, and use it many times. For example, in the preamble:

3. \fboxrule=0pt
4. \fboxsep=0pt
5. \color{gray}
7. \normalcolor
8. }

Later, in the document:

1. \begin{figure}[H]
2. \centering
4. \caption{Another caption.}
5. \end{figure}

Macros are not just for saving typing, but for consistency and easy changes.

Stefan

Cham
Posts: 885
Joined: Sat Apr 02, 2011 4:06 pm
Works perfectly well !

Thanks Stefan ! (by the way, see the preview in my last message, on the previous page...)

Stefan Kottwitz
Posts: 8946
Joined: Mon Mar 10, 2008 9:44 pm
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

bloomy
Posts: 2
Joined: Thu Mar 20, 2014 12:44 am
I found a very nice solution on http://tex.stackexchange.com/questions/81842/creating-a-drop-shadow-with-guassian-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
1. \documentclass{article}
2. % put all this in the preamble
3. \usepackage{tikz}
5.
6. % code adapted from http://tex.stackexchange.com/a/11483/3954
7.
8. % some parameters for customization
11.
12. \colorlet{innercolor}{black!60}
13. \colorlet{outercolor}{gray!05}
14.
15. % this draws a shadow under a rectangle node
18. \shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.south west)+(\shadowshift)+(\shadowradius/2,\shadowradius/2)$) circle (\shadowradius);
19. \shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) circle (\shadowradius);
20. \shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) circle (\shadowradius);
21. \shade[outercolor,inner color=innercolor,outer color=outercolor] ($(#1.north east)+(\shadowshift)+(-\shadowradius/2,-\shadowradius/2)$) circle (\shadowradius);
22. \shade[top color=innercolor,bottom color=outercolor] ($(#1.south west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) rectangle ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$);
23. \shade[left color=innercolor,right color=outercolor] ($(#1.south east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$);
24. \shade[bottom color=innercolor,top color=outercolor] ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$);
25. \shade[outercolor,right color=innercolor,left color=outercolor] ($(#1.south west)+(\shadowshift)+(-\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north west)+(\shadowshift)+(\shadowradius/2,-\shadowradius/2)$);
26. \filldraw ($(#1.south west)+(\shadowshift)+(\shadowradius/2,\shadowradius/2)$) rectangle ($(#1.north east)+(\shadowshift)-(\shadowradius/2,\shadowradius/2)$);
27. \end{pgfonlayer}
28. }
29.
30. % create a shadow layer, so that we don't need to worry about overdrawing other things
33.
34.
36. \begin{tikzpicture}
37. \node[anchor=south west,inner sep=0] (image) at (0,0) {\includegraphics[#1]{#2}};
39. \end{tikzpicture}}
40. % end of the preamble stuff
41.
42. % this is what you put in your document - replace {image} with your image file name e.g. {my picture}
43. \begin{document}
44.
46.
48.
49. \end{document}

Stef Pillaert
Posts: 33
Joined: Sat Oct 22, 2016 3:43 pm
This looks great! Can this also be used somehow to have the same effect on a box filled with text (minipage)?
Stef