[Magick-bugs] convert -combine not working as expected

[Dean S. Messing]

I have the red, green, and blue fields of an image stored
in three separate Truecolor .png files:  

    v_R.png, v_G.png, and v_B.png

Each of these images is greyscale when displayed.

I am trying to combine them into a single rgb .png image.

So I do: 

    convert -combine  v_R.png, v_G.png, and v_B.png v.png

I understand from the docs that this shd. take the R value
of the 1stt image, the G of the 2nd, and the B of the 3rd
will be placed into the respective colour planes of v.png.

But what I see, upon displaying, looks like the negative of the
desired image.

In fact

    convert -combine  v_R.png, v_G.png, and v_B.png -negate v.png

creates the correct image, v.png.  This looks like a bug to me.

convert -version
Version: ImageMagick 6.2.5 09/21/06 Q16 file:/usr/share/ImageMagick-6.2.5/doc/index.html
Copyright: Copyright (C) 1999-2005 ImageMagick Studio LLC



A second, less important "bug" is this:

  If I display a 16 bit image using "-depth 8", or an original 8 bit
image, and within `display' I use the magnifier, I see 8-bit values
for the subpixel colours as I wd. expect.
But if I (say) negate the image w/in `display', the values all become
16-bit, and are very difficult to read in the magnifier.

Is this a bug?

Shd. not an 8-bit image remain 8-bits, at least for the purposes of
the display?

Dean