Pix for the Week Ending April 10th to 12th, 2020

Started 6 months ago | Photos thread
xpatUSA
xpatUSA Forum Pro • Posts: 17,673
Found the problem, Steve!
1

Basically, the capture was well under-exposed. Contrary to intuition this can increase saturation in the capture.

Here's the X3F raw histogram for the whole image:

The red channel is 3EV underexposed.

For some petals:

I'd say less than 2EV DR for the reds - does not bode well for detail contrast.

Couldn't resist a go. In SPP 5.5.3 and viewing only the red histogram, I increased the exposure slider until the brightest red was around 245 according to the color picker. Everything else at default. Saved half-size sRGB JPEG Q9:

Not a lot of detail contrast, for which I blame the under-exposure, sorry.

Off to RawTherapee as a 16-bit TIFF only gained a slight improvement:

It is often thought that brightly-lit flowers are more saturated that those in lower lighting, and people cut back on exposure for that reason. But the opposite is usually the case.

So ETTR still rules OK especially with the low-sensitivity red layer in the Merrill sensors ...

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Pardon any correct nomenclature or credible references in this post ...
Ted

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