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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

enter image description here

in compositor, add a value node, right click -> paste as new driver

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Now you can do whatever you want with that value and calculate with it as you need it.

e.g.

enter image description here

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.

enter image description here

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    $\begingroup$ nice and simple :). didn't realize the resolution field can be used as a driver :)) $\endgroup$ Mar 14, 2022 at 11:32
  • $\begingroup$ 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. $\endgroup$ Mar 15, 2022 at 18:09
  • $\begingroup$ Great! Glad you made it! $\endgroup$
    – Chris
    Mar 15, 2022 at 18:14

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