Hi!
There seems to be a bug when converting GIF to a 1-bit black and white BMP. I came across this bug when writing a web-application using ImageMagick to process user uploaded images for printing on a thermo-printer, which requires 1-bit BMPs. Here is an example of the problem (note the "8-bit" vs "1-bit" in the two outputs):
C:\>convert.exe test.gif -remap printer_palette.bmp test.out.bmp
C:\>identify.exe test.out.bmp
test.out.bmp BMP 100x466 100x466+0+0 8-bit sRGB 187KB 0.000u 0:00.000
C:\>convert.exe test.png -remap printer_palette.bmp test.out.bmp
C:\>identify.exe test.out.bmp
test.out.bmp BMP 640x400 640x400+0+0 1-bit sRGB 2c 32.1KB 0.016u 0:00.020
This was tested with 6.7.9-7 and 6.8.0-Q16 on Windows 7.