Despoil OFX: allow for “respill”

More often than not, I have not only the issue of despoiling shots that are not FX form unwanted reflections, but also, re-spill shots where the despoil went too far.

I know that I cannot recover teh (let’s say) green channel is they went too far and slammed with an hammer, but occasionally i have to ad back some of the spill for either technical reasons or artistic ones.

So, the [despill] OFX should allow for both positive numbers (despill) as well as negative one (respill) with the inverse math.

Thanks!

If your shot is already despilled, where does the info about what the spill color and amount was come from? Proper despill kills all of that information. If you have both original and despilled one, what you can do is subtract the despilled one from original and plus the result over original again, weighting this operation as needed.

If problem is that despill has reduced the luminance in plate, tell your vfx vendors to do proper luminance restoration, not doing it is bad practice.

If your shot is already despilled, where does the info about what the spill color and amount was come from? Proper despill kills all of that information. If you have both original and despilled one, what you can do is subtract the despilled one from original and plus the result over original again, weighting this operation as needed.

If problem is that despill has reduced the luminance in plate, tell your vfx vendors to do proper luminance restoration, not doing it is bad practice.

There are many instances where you dont have the choice to “go back to the vfx vendor and ask for a re-do”, and yes, if the despill was too aggressive to start with, all is lost.

However, there ar instances where the de-spill was mild and we need to match with other shots where is it more beneficial to -respill- a shot than -despill- a whole scene just to match.

In that case you can work around the same way (until it gets added): do full despill of comp, subtract this from comp and add result back to comp with appropriate weighting. It is the same logic as saturation does when increasing it, since there is no saturation ”measure”, it is just original compounded with difference from desaturated version (sat uses multiply as basis math but idea is the same).

In that case you can work around the same way (until it gets added): do full despill of comp, subtract this from comp and add result back to comp with appropriate weighting. It is the same logic as saturation does when increasing it, since there is no saturation ”measure”, it is just original compounded with difference from desaturated version (sat uses multiply as basis math but idea is the same).

that seems unnecessarily overcomplicated..... BM did a whole cut page, allow for a little reverse math is not that difficult.