[Tex/LaTex] \includegraphics[width=40mm], reserves correct space, but includes full size image

graphicspngresolutionscaling

I'm using the following code to include an image. The reserved space in the resulting .pdf document is correct and changes according to the width I set. Nevertheless, the .png is always embedded in full size and doesn't change with the width parameter. I read in other posts, that maybe the .png is missing resolution information. But I changed the resolution with Photoshop and had no success either. I also added the resolution parameter to \includegraphics, with no luck.

\begin{figure}[bbp]
\centering
\includegraphics[resolution=72, width=40mm]{bilder/rmv_tag.png}
\caption[RMV-Kontaktpunkt am Bahnhof]{RMV-Kontaktpunkt am Bahnhof, Quelle:
http://goo.gl/i1k0l}
\label{pic:rmv}
\end{figure}

I'm using the graphicx-package and pdflatex on my mac.

Update: This is my image:
enter image description here

Best Answer

In the log file are you getting a message saying that TeX cannot find the bounding box size of the .png file? If so then you will have to supply the bounding box dimensions by measuring them in some graphics editor and then use the following \includegraphics command:

\includegraphics[bb=0 0 urx ury, width=40mm]{yourGraphicsFile.png}

where urx, ury are the x,y coordinates of the upper right corner in (big) points

Related Solutions

[Tex/LaTex] Image from \includegraphics showing in wrong image size

When you take a screenshot or export a figure from Matlab as a rasterised image,usually the resulting image file will not contain any resolution information (or "pixel density", usually measured in "dots per inch", or "DPI") in its metadata. When you include such an image in a LaTeX document using \includegraphics, a resolution of 72 DPI will be assumed. For example, that means that a screenshot that has a size of 1440x900 px will have a width of 1440 px / 72 px per in = 20 in = 51 cm in your PDF or DVI, so it will most likely be too big for your document. A computer monitor with a horizontal width of 15 in (= 38 cm) that is operated at a screen size of 1440x900 px has a resolution of 1440 px / 15 in = 96 dpi. If you want your screenshot to have the same size (in this case a width of 38 cm) both on your computer screen and in the printed document, you need find a way of letting LaTeX know that the resolution of the image is 96 DPI. There are a number of ways you can do this:

As an option to includegraphics:
If you're compiling your document using pdflatex, you can specify the resolution of the image by loading it using \includegraphics [resolution=<resolution in DPI>] {<filename>}. This will only work if no resolution information is included in the image.

By setting the image metadata using GIMP:
Go to Image -> Scale Image... and adjust the X and Y resolution after making sure pixels/in is chosen in the drop down menu. Then save your image.

By setting the image metadata using IrfanView:
In IrfanView 4.30, you can click Image - Information (or press I) to show the metadata of the image. The fifth row is called Resolution and should contain two fields in which you can set the horizontal and vertical resolution in dots per inch. By pressing the button Change, the new resolution will be set. The "physical" size of the image in cm and inch, which is obtained by multiplying the size in pixels with the resolution, is shown in the eigth line, called Print Size (from DPI). You can then include the image in your LaTeX document by calling \includegraphics {<filename>} without any extra options.

By setting the image metadata using ImageMagick:
On Linux systems, frequently the ImageMagick programs are already present or can easily be installed. You can then set the resolution information by calling convert <original file name> -density <resolution> -units PixelsPerInch <new file name> in a shell. You can then include the image in your LaTeX document by calling \includegraphics {<filename>} without any extra options.

[Tex/LaTex] Can pdflatex (or any tex package) automatically rescale included images which have been reduced in size

I've tried a little black magic with LaTeX, and found out how to do it without external scripts ─ though it still is somewhat dirty and not that easy to use. Basically, you would need to call ImageMagick from inside LaTeX.

To do this, you need to call it with --shell-escape parameter. This allows for using a command named \write18, that executes a parameter passed to it. Then you could add the following code to the preamble:

\newcommand{\doConvert}[2]{\immediate\write18{convert #1 -resample %
  300x300 -resize #2 #1.rs}}
\newcommand{\imgRs}[4]{\doConvert{#1.#2}{#3x#4}%
  \includegraphics[width=#3, height=#4, type=#2, ext=.#2.rs, read=.#2.rs]{#1}%
}

This enables you to call \imgRs{file}{extension}{width_in_pts}{height_in_pts} in order to convert the image to 300 dpi and include it in the document.

Of course you could always specify the dimensions in inches or any other units: you would just have to change the call to \doConvert in imgRs to account for scaling from unit used to points -- and you would have to use the dimensions consistently. It could be possible to actually find out what were the units used, or make some parameters optional, but it's independent of this solution.

Best Answer

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[Tex/LaTex] Image from \includegraphics showing in wrong image size

[Tex/LaTex] Can pdflatex (or any tex package) automatically rescale included images which have been reduced in size

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