See the Emacs 21.1 NEWS entry for tooltips for details.
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-** Some images are now supported on MS Windows.
-PBM and XBM images are supported, PNG is supported if the libpng and
-zlib headers were available when Emacs was built, and libpng and zlib
-DLLs are available at run-time. Likewise, JPEG is supported if the
-jpeg headers were available when Emacs was built, and jpeg.dll is
-available at run-time. Other formats which require external
-libraries may be similarly supported in future.
+** Images are now supported on MS Windows.
+PBM and XBM images are supported out of the box. Other image formats
+depend on external libraries. All of these libraries have been ported
+to Windows, and can be found in both source and binary form at
+http://gnuwin32.sourceforge.net/. Note that libpng also depends on
+zlib, and tiff depends on the version of jpeg that it was compiled
+against.
---
** Sound is now supported on MS Windows.