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Outstanding BW Open issues for Sigma Merrill RAW:

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BW Images still open as colour, and even if converted to BW, lose all the Foveon benefits. There's two ways to obtain BWs from Foveon RAWs, and neither of them work. Images taken with 1:1:1 Foveons (such as those with the Merrill series sensors) are able to deliver BW images without the mushiness of a colour filter array, or the heavy resolution loss from an antialias filter, like a Leica Monokrom, yet are not prone to strong aliasing artifacts like other cameras. All test images were all captured in BW, latest firmware, and open in many other applications as BW (some open in colour, and two of those use LibRaw).

Manually forcing them to convert to BW in Affinity Photo for the last nearly 8 months (all  production and beta versions) results in severely downgraded noise and detail and tonal range.

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