How "preserve luminosity" works?

Dear all,

I used Photoshop and there is a "preserve luminosity" in Color Balance function. Anyone knows how the "preserve luminosity" works when e.g. user is adjusting the midtone of the color channels?

Thanks,
J.

wrote:

Dear all,

I used Photoshop and there is a "preserve luminosity" in Color Balance function. Anyone knows how the "preserve luminosity" works when e.g. user is adjusting the midtone of the color channels?

Thanks,
J.

ah-fuckin-a! FM...