I’ll drag a couple of images into my Convert to B&W folder and watch what happens. Copies are created in the Converted folder and, sure enough, they’re in black and white.

If you want to convert color Images to Black and White on GIMP, then please follow one of these methods: Use Grayscale mode to turn images into black and white; Make use of the Desaturation feature; ...

I want to convert a standard image to a 256-colour bitmap that is NOT an 8-bit (per channel) image file - ie it needs to use a 256-colour palette. Surprisingly, there is no way to do this in ...