This is your foundation — where scene-referred linear light is sculpted into display-referred luminance. Controls here adjust contrast, rolloff, and mid-grey placement, giving you fine-grained power over dynamic range mapping and highlight/shadow behavior.

You can:

• Adjust peak luminance for SDR or HDR displays

• Define middle grey luminance in nits

• Add toe or shoulder rolloff

• Introduce contrast shaping above or below grey

• Offset shadow detail for density control

Purity adjusts color intensity relative to luminance — vital for taming overly saturated highlights or boosting muted midtones. It’s where OpenDRT distinguishes itself with graceful handling of purity compression that avoids harsh clipping and maintains perceptual smoothness.

A module for fine-tuning the brightness of saturated colors. It allows compensation for clipping in narrow-band spectral sources (like LEDs) and introduces pleasing variations in perceived “density.” Think of it like adding a soft lens glow to vivid colors — or pulling them back when they push too far.

Color perception isn’t always linear. This module lets you guide hue paths across the luminance and purity axes — useful for addressing phenomena like the Abney Effect, or just creating pleasing hue bends as tones evolve from dark to bright.