# TikZ trapezoid transformation (vanishing point) [closed]

Within a TikZ drawing, I want to distort a 2D rasterimage (from \includegraphics) so that it appears to be rotated by 90° around the vertical axis in 3D (it should look perpendicular to the sheet of paper). I've managed to achieve a transformation with yslant and xscale, like the following.

\begin{tikzpicture}
\node (term) at (0,0) [yslant=-0.7,xscale=0.3]
{\includegraphics[width=40mm]{image.png}};
\end{tikzpicture}

which distorts an image like this

a
|\
a---------b                 | \
|         |                 |  \
|         |      -->        c   b
|         |                  \  |
c---------d                   \ |
\|
d

I'm not really happy with this: The distance |a-c| should be smaller than |b-d|. How can I achieve this?

There is an example of a cuboid which looks pretty nice, but it seems useless to distort an imported raster image.

-

## closed as too localized by Qrrbrbirlbel, Heiko Oberdiek, Kurt, Xavier, Tom BombadilJun 10 '13 at 4:40

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Welcome to TeX.sx! No need to add signature, your username is included in the lower right of your Q. –  Peter Jansson Jan 28 '13 at 23:42
The transformation you achieved would be the result of a parallel projection. You actually want to simulate a perspective projection? I don’t think this is doable with vanilla TikZ options. You probably need to calculate these transformations. –  Qrrbrbirlbel Jan 28 '13 at 23:46
This is not doable via PDF transformation (TikZ and PGF use PDF transformations). You need to transform your rasterimage via Gimp (or Photoshop). –  Paul Gaborit Jan 29 '13 at 0:13
Maybe a duplicate : tex.stackexchange.com/questions/52578/perspective-transform ? Nope you have an image, nevermind –  percusse Jan 29 '13 at 0:32
I think this is best done with ImageMagick’s convert tool. Using example-image.png from the mwe package one can do convert example-image.png -distort Perspective "0,0,0,40 0,300,0,260 400,0,400,0 400,300,400,300" example-image-distorted.png. Though, I couldn’t get the now black background color to be either white or transparent. I’m sure, it is somehow possible. –  Qrrbrbirlbel Apr 9 '13 at 17:02