Arri EI Map

ARRI EI Map DCTLe, a Davinci Resolve Studio DCTL effect by Driftwood, overlays Arri style “false‐color” bands onto your image so you can instantly see which parts of the scene fall into six exposure zones (from very bright to very dark).
In super simple terms if you're an Arri Camera user (Digital Imaging Technician, Colorists & Post-Production Teams, Cinematographers, VFX Artists, Filmmakers, Live Broadcast Teams) then this is for you :

1.     You pick your camera curve (Log C3 supported cameras, Log C4 Arri 35, or Log C4 A265) and an ISO-equivalent (EI) setting.

2.     The dctl looks at each pixel’s brightness (in the chosen Log-C space) and figures out which of six buckets it belongs to:

o   Very bright nearly clipping (shown as red)

o   A bit less bright on the way to clipping (shown as yellow)

o   Mid-bright (shown as pink) Light Skintones may reside here!

o   Middle gray (shown as green) Good all round exposure and skintones

o   Shadows (shown as blue) Near the shadow noise floor edge

o   Deep shadows/noise floor (shown as purple)

3.     It colors each pixel according to its bucket. That way, as you’re grading or framing, you immediately see which parts of your image are clipping, which are sitting on middle gray, and which are in shadow/noise territory.

4.     If a pixel doesn’t fall into any of these six “false-color” ranges, it either shows as a plain gray (if you’ve toggled “Show Greyscale”) or it just passes through your normal image.

There’s also an optional “legend” you can turn on that draws a color key and text overlay labels (e.g. “1/3 STOP BELOW CLIPPING,” “MIDDLE GRAY,” “NOISE FLOOR,” etc.). That legend helps you remember exactly what each color means in terms of exposure stops.

In everyday talk: this DCTL paints your image with six easy-to-read colors so you always know whether something is too bright, too dark, or sitting at perfect middle gray—no more guessing from tiny waveform scopes.

The DCTLe follows strictly with Arri's Exposure zone specification with Achromatic Calculation, False Color Calculation, LogC3 and LogC4 Precomputed Bounds and true LogC encoded signals match exactly what is on camera. 

This dctle is byte-for-byte identical to Arri’s normalized tables!