Flood Fill settings

[cayenne]

There are so many different combinations of settings for Flood Fill, I can't find the combination that will do this:

I have a portion of an image that is all one color, but in different shades, from darker to lighter. I'd like to Flood Fill with a different color, and have the color adopt the shading of the original.
Example, original is black, dark grey, light grey; I'd like to change that to dark blue, medium blue, light blue.

Can I use the Flood Fill for that? which settings?

PaintShop Pro 2018

Cayenne

[hartpaul]

In effect you want to replace the colors of something like a gradient with versions of the new color.
1. You can make a new gradient with the colors of your choice.
or better still
2. Use the Change to Target brush whic is near the bottom of the group of brushes just below the Paintbrush.
If you check out the Learning centre , it says it will replace all instances of the color with the new color but retain the detail beneath. Just use a very large brush size.