How do I make windows emacs display PNG and JPEG images?

[Steinar Bang]

 Windows 8 Home Edition 64bit
 GNU Emacs 24.3.1 (i386-mingw-nt6.2.9200) of 2013-03-17 on MARVIN
 From ezwinports[1]:
  jpeg-v9a-w32-bin.zip
  libpng-1.6.12-w32-bin.zip

I have downloaded the jpeg and libpng zip files from ezwinports[1] and
unpacked them and put the following .dll files in the emacs bin
directory:
 libpng16-16.dll (dated: 2014-06-21)
 zlib1.dll       (dated: 2008-07-13)
 libjpeg-9.dll   (dated: 2014-06-21)

However, emacs still starts up without PNG and JPEG support.  The
following expressions both eval to nil in the scratch buffer:
 (image-type-available-p 'jpeg)
 (image-type-available-p 'png)

Is there a way to debug this further?  Do I have to copy some of the exe
files as well as the dll files?

Thanks!


- Steinar

[1] http://sourceforge.net/projects/ezwinports/files/