Export/Import BW tiff issue

Hi,

As I'm new to Capture one, I'm sure I'm doing something wrong, but surely you can help me...

I processed an image in BW (with BW histogram), to tiff 16bits.
Whatever the colorspace I choose for the export (sRGB, Adobe1998, Prophoto), when I import back the file I've just exported, the histogram shows me the file is not in pure black and white.

Is that normal?
When I import the same files in PS (with the appropriate color space), they look also not perfectly Black and White (on the histogram), so I believe something is wrong with my export from C1P.

BTW, when comparing the imported tiff vs source in C1P, there is a small, but noticeable difference in contrast. The imported tiff is a little bit less contrast.

I'm pretty sure it's my mistake, but it's starting to drive me crazy...

Thanks for your input,

Best,

RÃ©mi

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