Using a scanner with SharpEye.

Both SharpEye 1 and SharpEye 2 will work with pre-scanned BMP or TIF images. Version 2 also has the facilty to scan directly into the program and it is only this option that requires the scanner to be TWAIN compatible. All scanners on the market have come with TWAIN compatible drivers since the days of Windows 3 so I shouldn't think that there should any problems on that score anyway.

In theory you should even be able to get a satisfactory image from a digital photo or webcam and change it to B&W.