For Premiere Pro CC users: some UM46k curve presets

As most of you (hopefully) know, the BMD cameras do not use analog gain when switching ISO, but apply different curves corresponding to the ISO camera setting. If your highlights clip in ISO1600 then they clip in ISO200, too.

After recording in ProRes sometimes you might see in your editing suite that you had chosen the wrong ISO setting (e.g. the bright light on a sunny day made you misinterpret the preview of the camera LCD).
Most of the time you will end up using a higher ISO setting then necessary.
This should not pose a big problem for correction in post, it just might be a little bit time consuming to get it right.

So for your convenience I have created 3 RGB curve effect presets which can correct 1-3 stops down, making the footage almost exactly look like it had been shot in a lower ISO. No magic here.

Get the UM46k_-_ISO_downstopper.zip here

Installation:
Download and unzip the presets.
In Premiere Pro CC and later go to your effects panel and select the "Presets" folder. Right click it and choose "Import Presets". Go to the location of the downloaded presets and select the "UM46k - ISO downstopper.prfpset" file. Voila.

"Raw" ProRes source screenshots:
ColoredPencils_ProRes_ISO200_source

ColoredPencils_ProRes_ISO400_source

ColoredPencils_ProRes_ISO800_source

ColoredPencils_ProRes_ISO1600_source

You can see that this shot has no clipping regardless of the ISO, which was the only setting I changed.

Simply dropping a LUT:
Footage with a LUT applied (ACES to rec709 from Jamie) + a 1.2 lumetri saturation boost.
ColoredPencils_ProRes_ISO200_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO400_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO800_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO1600_+LUT-ACES_2_rec709+saturation

Now with the downstopper curve applied (except for ISO200):
ColoredPencils_ProRes_ISO200_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO400_-1stop_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO800_-2stops_+LUT-ACES_2_rec709+saturation

ColoredPencils_ProRes_ISO1600_-3stop_+LUT-ACES_2_rec709+saturation

The samples now look all the same - like all of them were shot with ISO200.
If you need for example 1 and 1/2 stops you could always add an additional RGB curve and drag the master curve a little bit down.

Note: In no way this will give you more dynamic range. Clipped is clipped.

Bonus curves:
Sometimes you just need a little boost in the shadows or a drop in the highlights.
For this I have created three additional RGB curve presets, one will raise shadows only (RGB Pre-Shadow), one will lower highlights only (RGB Pre-Highlight) and one does both in one curve (RGB Pre-Curve). Practically this will reduce the contrast of your footage. It is best to apply them before the downstopper presets.

Use them in this order:
1. RGB Pre-Curve/Highlight/Shadow
2. ISO - x stop
3. Lumetri LUT

Get the UM46k_-_pre-curves.zip here

Here is a real life example from an interview I have shot this week:

URSA Mini 4.6k
ProRes HQ422 2160p25 filmlog
ISO1600
180° shutter
WB 5.200K/Tint +14
F5.2 @ 35mm
Sigma 18-35mm f/1.8 DC HSM
Schneider Platinum IRND 1.2 (-4 stops)

The camera display misled me to think I'd need ISO1600 (didn't check false color)

Interview_outside_ISO1600_source

Interview_outside_ISO1600_-2stops

Interview_outside_ISO1600_-2stops+LUT

Interview_outside_ISO1600_-2stops+LUT+CC+PowerWindows (background, face, body)