Merrill B & W, Part 1

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Veijo Vilva
Veijo Vilva Regular Member • Posts: 389
Merrill B & W, Part 1

I've done some experimenting concerning Merrill B & W conversion. First of all, I got rid of a misconception probably most of us have harbored, the idea that the SPP color mixer can select a pure specific layer, usually the top, "blue", layer.

Here is my test photo in color, downsized:

then some largish crops thereof, view at the full resolution:

A. the original

B. the top layer separated with dcraw, clips near the lower left corner

C. SPP 5.5.3 "Blue", doesn't clip

D. the middle layer separated with dcraw, lowish contrast

E. SPP "Green", higher contrast but too dim

F. the bottom layer separated with dcraw, very low contrast, dark and noisy

G. SPP "Red", something completely different, this version is quite usable

Inspecting the raw bottom layer crop and comparing it with the SPP "Red" crop, it is immediately obvious that there is no way of arriving at the SPP version based merely on the bottom layer whatever you do, a lot of information must come from the upper layers.

In photos like this, the whitewashed walls often cause the top layer to clip.  In this particular  case, SPP was able to handle the situation automatically, without user interaction, i.e., I didn't need to apply Fill light even for the color version.

In Part 2 I'll take look at the B&W micro-contrast.

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 Veijo Vilva's gear list:Veijo Vilva's gear list
Sigma DP2s Sigma DP2 Merrill Sony RX100 Sigma DP3 Merrill Nikon 1 V1 +7 more
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