I have various effects like film grain, blur and lens distortion in my compositor. But if I do quick 50% scale renders, the effects become too 'large'. So the blur is too blurry, for example. So what I need is for those effects to be relative to render resolution size. Is this possible?
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Right click over the render resolution % (or whatever value you need), right click, copy as new driver
in compositor, add a value node, right click -> paste as new driver
Now you can do whatever you want with that value and calculate with it as you need it.
e.g.
This is just an example -> it makes no sense but this is how you do it.
Note: for blur i think you can just check "relative" to get what you want.
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1$\begingroup$ nice and simple :). didn't realize the resolution field can be used as a driver :)) $\endgroup$ Commented Mar 14, 2022 at 11:32
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$\begingroup$ Thanks! This has opened up many possibilities. I've added inverse math to alter lens distortion based on a focal length driver value. Wide lens = more distortion. Long lens = low distortion. This saves me manually fiddling in the compositor when switching or tweaking cameras. $\endgroup$ Commented Mar 15, 2022 at 18:09
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