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The reason for my interest in luminosity is based on the work of a number of famous artists, e.g. Monet, who used paint of two different colours but with the same luminosity next to each other. (Monet Sunrise or Poppies) The effect of doing this is to create a shimmering feeling by the viewer. If you take these pictures and turn them into b&w the colours disappear. This is because of an optical effect which means that the human eye can't quite place the colours together as they are slightly different locations on the art work. I have been looking to see if this effect can be achieved with photography. But of course paint is not the same an an rgb print!
I have taken an image, with two different colours in them, placed them side by side with a black and white variant and then by eye tired to get the colours to be the same b&w shade the same. If they are then they are the same luminosity as the colours will look exactly the same in b&w ! Its a bit of a fiddle to say the least!
I have attached the image I have been playing with to give you an idea of what I mean. The red and orange I am trying to get to the same luminosity, but I could have chosen the green. Images attached 608.1 has been adjusted, the second one has not. The difference is subtle!. Would be interested in your view on this,
best regards, John
On Wednesday, 26 June 2024 at 14:46:19 BST, Helen (Capture One) <support@captureone.zendesk.com> wrote:
Attachment(s)
4K7A2608 1.jpg
4K7A2608.jpg
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Current workaround
looking at the colors in B&W and manual comparison |
Hi @Guest , this is an interesting topic!
Have you tried playing with our "skin tone" tool, it is actually powerful on a lot of tasks that are not skin related?
In particular, I believe our uniformity slider for luminosity could help you here. I would mask the area of interest, then go into the skin tone tool, choose a color range that encompasses all the hues of interest, and work with this one slider only. Pushing it completely to the right should make the luminosity very uniform, regardless of the hue.
You could then confirm it is the case by using Black & White as you are doing.