I shot this photo last November, at altitude 5000m in Colombia’s Los Nevados National Park. It was cold and misty, so the conditions were not good for photography, but the Helmetcrest was happy to pose very close to the cafe/National Park Welcome Centre.
As you can see the bird is feeding on a pretty purple flower with whitish petals, however the flowers appear to be a uniform purple to human eyes. The DT colour picker shows the blue channel is maxed out at 255 and the vectorscope suggests the petals are rendered as white because they are out of gamut - which I am pretty sure is due to ultraviolet light.
So the challenge is to find the best strategy of modules masked and blended to show good, natural colour and detail on both the Helmetcrest and the flowers.
In rawproc, the linear RGB with just the regular color primaries supplied by libraw makes nice purples. I then added my default filmic curve, and it blew out the colors as is depicted in your rendition. So, I threw out that curve and put in a regular control point curve, where I shaped the contrast to occur in the lower third of the histogram. That pulled the shadows very low, making the flower and bird stand out more. No high shoulder on the top end to blow out the lighter parts of the flowers… In rawproc:
Edit: Oh, most Nikon cameras for which I’ve seen SSF data show a pretty hard cutoff at 400nm, which is just above the lower end of the visible spectrum at 380nm. It’s UV, but you can see it, so you want it…
ER6_0629-1.jpg.out.pp3 (15.6 KB)
RT-5.9 highlight reconstruction with color propagation. Exposure boost locality on the tiny dinosaur. Copious false color suppression and chromatic aberration correction applied (I think this enhanced the natural iridescence a bit).