The documentation for QPixmap::toImage() says
"If the pixmap has greater than 8-bit depth, the returned image has 32-bit depth."

While this is true on X11, it is not true for raster pixmaps, like on Qt/Embedded.
On a 16 bit display, doing
QPixmap::grabWidget(w).toImage();
gives a 16 bit QImage, which contradicts the documentation.

In Qt3 convertToImage() made it a 32 bit QImage indeed like the documentation says.
So this is a double bug:

• The above paragraph of documentation for toImage() should be explicit about "x11 only".
• QT3_SUPPORT method convertToImage() shouldn't just call toImage(), it should also
  apply the qt3 logic of converting to ARGB32 if the depth is >= 8.