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On Windows, IrfanView can create a bi-level version of Gray Level Images conveniently.
Is there any command line tool available on Linux?
convert image1.jpg -colorspace Gray image2.jpg (grayscale)
convert image1.jpg -colorspace Gray image2.jpg
convert image1.jpg -separate image2.jpg (channels)
convert image1.jpg -separate image2.jpg
convert image1.jpg -monochrome image2.jpg (black and white)
convert image1.jpg -monochrome image2.jpg
identify -list format
Required, but never shown