I have found that reducing the opacity against a white background is a good way to find usable lighter and less saturated tints of a base color.
As an example take this picture of an orange color:
The lower row shows the variants. The percentages are the opacities.
Having a white background and reducing the opacity is good when I search good tints, but I like to use equivalent 100% opaque RGB colors in the final product.
How do I calculate or otherwise find the equivalent RGB numbers, when the RGB numbers of the base color and the opacity are already selected?
I have tried color picker, but in Illustrator it at least gives only the base color.