How do I achive 4bpp grayscale mode?

When I save a PNG file (which I've read DOES support 4bpp grayscale) I can't figure how to save it in 4bpp grayscale mode. The modes I have achived are
32bpp (RGB + transparency)
24bpp (RGB)
8bpp (indexed color)
8bpp (grayscale as indexed color)
8bpp (grayscale)
4bpp (indexed color)
4bpp (grayscale as indexed color)
1bpp (black and white)
(some of these I've achived by converting with an external program after saving from Photoshop, but the true 4bpp grayscale mode remains quite elusive)
Setting the palette to "grayscale" indexed color mode does not automatically save the image as a grayscale image, just as an indexed color image in which the palette is grayscale. I'm trying to save a true 4bpp 16shades grayscale mode (NOT indexed mode) image in the PNG format, which I've read DOES support this mode. Please tell me any tricks, easter eggs, hints, etc that I might utilize in Photoshop to pull this off.
Thanks in advance.

Hello,
The dots are an image, and it is done with CSS. The dot image
is applied as the background image in a link.
Specifically, it's applied to the bottom and given the
attributes to start on the left and not repeat.
#nav a
display: block;
font-size: 12px;
color: #000;
padding-left: 10px;
line-height: 22px;
vertical-align: middle;
background: url("/images/sidenav-dotline.png") left bottom
no-repeat;
You vertical navigation uses rollover images, so some options
are:
a) Add dots to the bottom of each image.
b) Rebuild your menu using a dotted background image on the
links like they did. (You'll lose your faded text and
over/underline that you achieved by using images but the page would
load faster).
c) Your rollover images are each in a table cell, so you
could give the table cell some padding to lift the images off the
bottom of each cell, then apply a dotted line image as the
background for each cell, positioned at the bottom left and not
repeating.
Hope that helps,
Tim

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>
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How do I achive 4bpp grayscale mode?

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