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What is Bit Depth?

Bit depth specifies how many bits represent each pixel, pixel channel, or audio sample. A higher depth permits more distinct intensity, color, or amplitude values but increases uncompressed data size.

How Bit Depth works

Bit depth sets the number of discrete code values available to represent a sample, but interpretation depends on whether the value belongs to a whole pixel, one color channel, or an audio sample. More codes reduce quantization steps and provide editing headroom, while storage and bandwidth grow before compression. Effective precision may also be lower than the container’s declared depth. Pipelines track depth through decoding, color conversion, processing, and final delivery to avoid silent truncation.

Key facts

  1. For an unsigned integer channel, n bits provide 2 to the power n code values; channel count must be considered separately when calculating a pixel’s uncompressed storage.
  2. Converting to a lower depth rounds or quantizes samples; dithering can trade structured banding for less conspicuous noise but cannot preserve the original numeric precision.
  3. A file can declare a higher depth than a display path renders, and an intermediate filter may internally use higher precision to prevent cumulative rounding before export.

When Bit Depth matters

Choose bit depth according to required gradient fidelity, editing headroom, storage, and format support. Reducing it can cause banding or quantization noise, while excessive depth wastes space in limited pipelines.

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