image convert: remove alpha, postscript 2.0

[Graham Percival]

I think I've discovered the problem with windows users not being able 
to print page 2 of the manual: graphics which use alpha.

$ cd Documentation/user/
$ file *.png
baer-flat-bw.png:    PNG image data, 374 x 513, 8-bit gray+alpha, 
non-interlaced
baer-flat-gray.png:  PNG image data, 381 x 528, 8-bit grayscale, 
non-interlaced
henle-flat-bw.png:   PNG image data, 376 x 507, 8-bit grayscale, 
non-interlaced
henle-flat-gray.png: PNG image data, 323 x 507, 8-bit grayscale, 
non-interlaced
lily-flat-bw.png:    PNG image data, 296 x 487, 8-bit/color RGB, 
non-interlaced

$ file out-www/baer*
out-www/baer-flat-bw.eps:   PostScript document text conforming at 
level 3.0 - type EPS
out-www/baer-flat-bw.png:   PNG image data, 187 x 257, 8-bit/color 
RGBA, non-interlaced
out-www/baer-flat-gray.eps: PostScript document text conforming at 
level 3.0 - type EPS
out-www/baer-flat-gray.png: PNG image data, 191 x 264, 8-bit/color RGB, 
non-interlaced

$ file out-www/*.eps
out-www/lily-1074176269.eps:    PostScript document text conforming at 
level 2.0 - type EPS
... and a bunch more stuff

I see two possible problems: the +alpha on baer-flat-bw.png (and thus 
the "color RGBA"), and the PostScript 3.0 in the EPS.  bae-flat-bw.png 
is just a black and white picture of a flat; I'm sure it doesn't need 
alpha.  However, I couldn't figure out how to convert it into an image 
without alpha (using convert).  Could somebody familiar with graphics 
and/or ImageMagik suggest a command?

In addition, is the PS 3.0 a problem?  If so, could somebody suggest a 
command to make convert produce a PS 2.0 file?  Currently these files 
are simply being changed with
convert baer-flat-bw.png out-www/baer-flat-bw.eps

Thanks,
- Graham