---
title: "Bit Depth"
url: https://postproduction.studio/en/glossary/bit-depth
language: en
description: "Bit depth is the number of bits used to represent each color channel of each pixel in a digital image. It directly determines the number of discrete ton..."
updated: 2026-10-25
---

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# Bit Depth

Bit depth is the number of bits used to represent each color channel of each pixel in a digital image. It directly determines the number of discrete tonal values available per channel and therefore the smoothness of gradients, the headroom for grading and the resistance to banding. 8-bit per channel (24 bits per pixel for RGB) provides 256 values per channel and is the consumer/web standard — fine for finished display content but inadequate for grading (any aggressive correction will introduce banding in skies and shadows). 10-bit per channel (1024 values) is the broadcast and mastering minimum, required for HDR (PQ/HLG encoding cannot work at 8 bits without severe artifacts) and standard for ProRes 422, DNxHR HQX, HEVC Main 10. 12-bit per channel (4096 values) is used in ProRes 4444 XQ, DNxHR 444, DCP, Dolby Vision and finishing-grade pipelines where extensive grading happens downstream. 16-bit per channel (used in OpenEXR half-float and some VFX intermediate formats) gives extreme headroom for compositing math. Float bit depths (32-bit linear EXR) preserve values above 1.0 for HDR scene-linear compositing. In post-production, the rule is to capture and grade at the highest practical bit depth, only reducing at the final delivery encode where 8 or 10 bits is acceptable. Bit depth applies to both luma and chroma; chroma subsampling can reduce effective chroma bit depth even with deep luma. Reference: ITU-R BT.2100 (HDR system parameters) and the OpenEXR specification.

Image, Color ScienceColorist, DIT, CompositorCapture, Color Grading, VFX

## Related terms

[Color Space](https://postproduction.studio/en/glossary/color-space)[Chroma Subsampling](https://postproduction.studio/en/glossary/chroma-subsampling)[EXR (OpenEXR)](https://postproduction.studio/en/glossary/exr-openexr)

Each extra bit doubles the number of code values per channel. 16-bit floats are essential for VFX compositing math.

## Articles covering this term

* [HDR Formats: PQ, HLG, HDR10, Dolby Vision Workflows

  Complete HDR guide: PQ vs HLG curves, HDR10/HDR10+, Dolby Vision, dynamic metadata, mastering workflows, dual SDR/HDR delivery strategies.](https://postproduction.studio/en/image/hdr-formats)