I believe the current version of HDRLight Studio has a tool that does this. You might want to toy with it to see if its interaction model is worth emulating.
- Place Highlight Tool Eugen Sares
- Re: Place Highlight Tool julian
- RE: Place Highlight Tool Brent McPherson
- Re: Place Highlight Tool Alan Fregtman
- Re: Place Highlight Tool Ed Manning
- Re: Place Highlight Tool Vincent Ullmann
- Re: Place Highlight Tool julian
- Re: Place Highlight Tool Eugen Sares
- Re: Place Highlight Tool Eugen Sares
- Re: Place Highlight Tool Julian
- RE: Place Highlight Tool Brent McPherson
- Re: Place Highlight Tool Julian
- RE: Place Highlight Tool Brent McPherson
- Re: Place Highlight Tool julian
- RE: Place Highlight Tool Brent McPherson