Shadowcatcher shadows different from solid to compositing

[TeoRossi93]

Hi guys!
I usually don't work with backplates and I'm finding out some problems with a test I'm working on.
As you can see in the attached images there are many differences between saving a png and composite it in photoshop (the car of course is rendered) and rendering a 3d object straight onto a backplate.
Basically the image on the left has the right amount of shadows while the whole plate is affected by my tone mapping setup (and even reflections/refractions are odd), the image on the right is all good (including reflections and stuff) but the shadow is so dark.
How can I get the shadows that I have on the left even on the right image?

Thank you guys

[pokoy]

Not sure how you're comping them but one problem is that when you're working in anything else than 32bits and multiplying shadows, multiply is a subtractive mode, meaning it only subtracts values (darkening) but not adding any values (GI lighting). I just throw an adjustment layer on top of the shadow (levels for example) and increase mid-tones, this mostly helps.

[maru]

I am not100% sure, but it looks like the issue from this thread: https://forum.corona-renderer.com/index.php?topic=18936.0

[TeoRossi93]

I am not100% sure, but it looks like the issue from this thread: https://forum.corona-renderer.com/index.php?topic=18936.0

Yep looks like the same thing, I will do some tests with 32 bits exr and maybe I will try some small tweaks on the hdr gamma to make shadows darker/lighter