Probelm with "compare" of bitonal BMP files

I’m using “compare” to check differences between two bitonal
(bi-level) BMP files.  

ie., one bit per pixel.

 

The files are identical except for a few bytes in the
header.  (Verified using a 

hex editor, and with the DOS “fc” command).

 

Even so, the compare command yields a distinctively
non-blank output image – 

It looks like a faint, washed-out copy of the original.

 

I’ve tried these options: -depth 1 -type Bilevel  …. to no
avail.

 

Is this normal behavior?  It sure doesn’t seem right to me,
but I’m rather a 

newbie at ImageMagick.

 

Why does “compare” produce an RGB output file when comparing
two 

bitonal input files?  How did the output get to be
shades-of-gray, when 

the input is bitonal?

 

 

Rafe Bustin

 


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