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We don't use 32 bit image types for BCG since this is a very rare application need. First of all, its unlikely anyone has a 32 bit camera that would be acquiring such images (most are 8 bit). Also, 32 bits usually implies color images and BCG is primarily used on monochrome images. There is an example for using a 16 bit BCG which you may find useful that I have attached as well.
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It turns out that I am working with 32-bit monochrome data from an AFM, and a BCG function would actually be useful for examining corresponding images. I suppose I'll take a shot at writing a function to do this.