How to convert between bitmap (.bmp) file format types using mogrify?

Question

How can I convert these BMP files to an older format?

I tried:

mogrify -format bmp -define bmp:format=bmp4 *.bmp

But it didn't work.

Answer 1

"BMP4" is the newer format. Try BMP2 or BMP3 instead, to get an older format.