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PQ Curve: Meaning & Definition in Film

A perceptual quantizer transfer function standardized for HDR distribution.

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PQ Curve Explained

PQ Curve: Definition

The Perceptual Quantizer (PQ) curve, formalized as SMPTE ST 2084, is a transfer function designed to encode HDR luminance in a way that aligns with human visual perception. Unlike gamma curves, PQ allocates code values to match the eye’s sensitivity across a 0.0001 to 10,000 cd/m² range.

Standardization and Use

Developed by Dolby and adopted by SMPTE, the PQ curve underpins HDR10, Dolby Vision, and HDR10+ formats. It defines a PQ EOTF (electro-optical transfer function) for mastering displays and an inverse OETF (opto-electronic) for camera encoding.

PQ Curve: Advantages

By matching perceptual steps, PQ minimizes banding and maximizes bit-depth utilization. It supports consistent HDR reproduction across varying display peak luminances, crucial for streaming and broadcast workflows.

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More Filmmaking Terms

Entries filed on the same shelf as PQ Curve, each with the one-line answer first. They are the words that usually come up in the same conversation.

All 913 terms

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