Update: After two days without reply, I decided to also ask on the Flamingo nXt forum.
I picked colors from an image of a flat object that I put on a flatbed scanner. However, when I render, then colors come out much brighter. See below: The matte dark blue material comes out light blue. I know that I could adjust brightness in the render dialog. However, that seems a bit random, and furthermore I assume this reduces dynamic range.
When I add a gray ground plane, then automatic exposure is different, and colors are darker. I assume the exposure algorithm stretches the histogram.
In the end I just want accurate colors and neutral lighting, though with a little bit of variation to make metal parts look like metal.
What is a good workflow for matching colors to an image (e.g. a photograph)?
Matte dark blue as picked from the image: rgb(28, 36, 53)
HDR lighting: I am looking for smooth shadows, and a little bit of variation (for metal objects that will also be in the scene).
By default: Exposure is much too bright.
With gray ground plane.