You can easily import any image information in PDF or postscript format into PCB. If you need to convert an image from a standard format like JPEG, I recommend using GIMP or your favorite image editor (some editors might not allow direct conversion to postscript). When converting the image to a postscript file, make sure it is at the scale you want imported into PCB **Sizes cannot be changed after this step**.

If you have a PDF file it can easily be converted into a PS file using this utility in Linux PDF2PS
http://www.linuxcommand.org/man_pages/pdf2ps1.html

After you have the file in postscript file in the size you want, you will want to get a very useful package called pstoedit. This package allows the translation of .ps files into several different editable file formats. Here is the list from the developers website. (http://www.pstoedit.net/)

Currently pstoedit can generate the following major formats:

* Tgif .obj format (for tgif version >= 3)
* .fig format for xfig
* pdf - Adobe's Portable Document Format
* gnuplot format
* Flattened PostScript (with or without Bezier curves)
* DXF - CAD exchange format
* LWO - LightWave 3D
* RIB - RenderMan
* RPL - Real3D
* Java 1 or Java 2 applet
* Idraw format (in fact a special form of EPS that idraw can read)
* Tcl/Tk
* HPGL
* AI (Adobe Illustrator) (based on ps2ai.ps - not a real pstoedit driver - see notes below and manual)
* Windows Meta Files (WMF) (Windows 9x/NT only)
* Enhanced Windows Meta Files (EMF) (Windows 9x/NT only)
* OS/2 meta files (OS/2 only)
* PIC format for troff/groff
* MetaPost format for usage with TeX/LaTeX
* LaTeX2e picture
* Kontour
* GNU Metafile (plotutils / libplot)
* Skencil( http://www.skencil.org )
* Mathematica
* via ImageMagick to any format supported by ImageMagick
* SWF

Strangely it is not on the list, but PCB is one of the supported formats. Once you have this package all you need to do is run this command:

"./pstoedit -f pcb [input .ps file] [output .pcb file name]" Note: it is -f pcb, not -f PCB.

Then just open up PCB and select "File->Load Layout Data To Paste-Buffer" and open the newly created pcb file.

The shortened version:
1.) Create a .ps file
2.) Use pstoedit utilizing the "-f pcb" option to convert the .ps to a .pcb file
3.) Load the .pcb file into PCB

There are tons of other useful tricks for using PCB in the geda wiki linked below:

http://geda.seul.org/wiki/geda:pcb_tips