Brightness and Resolution (BRC)

Project Optional. Used for the PDF report header.

Project name Prepared by Display units

Aspect ratios

Projector imager aspect Auto-filled from selected projector; editable. Screen aspect Content aspect

Screen

Calculation based on Value (mm) Gain Derived dimensions

Projector

Projector H pixels V pixels Delivered lumens Measured / PLC output. Falls back to rated × derate if blank. Rated lumens (fallback) Derate factor

Anamorphic optic

Optic Stretch factor 1.0 = no stretch. 1.33 = standard HE. Transmission Fraction of light through the optic (0.95 = 95%).

Calculation method

Method Methods gated by anamorphic optic state.

Results

Pick a projector to begin.

Configuration

Computed

How to read this

The four-stage pipeline

Stage 1 — Screen is the target. Stage 2 — Projector Output shows the content on the imager after digital pre-stretch, plus any source-pixel crop. Stage 3 — Optically Scaled shows the beam after the anamorphic optic. Stage 4 — Digitally Scaled is the final picture on screen with letterbox / pillarbox where it doesn't match screen aspect.

Brightness targets

Residential cinema: 8–14 ftL SDR; 14–25 ftL HDR-capable. The status colour reflects the resulting ftL range — outside 5–30 ftL is flagged as out-of-range.

v3 corrects v1 anamorphic maths

The 2019 BRC produced wrong brightness in some anamorphic configurations. v3 corrects the maths from first principles (see docs/calculators/brc.md §4). Numerical differences vs the v1 tool in HE/VC configurations are intentional.