modern-pdf-lib

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modern-pdf-lib / convertToGrayscale

Function: convertToGrayscale()

convertToGrayscale(pixels, width, height, channels): Uint8Array

Defined in: src/assets/image/grayscaleDetect.ts:89

Convert an RGB/RGBA image to single-channel grayscale.

Uses the ITU-R BT.601 luma formula:

gray = 0.299 × R + 0.587 × G + 0.114 × B

The alpha channel (if present) is discarded.

Parameters

pixels

Uint8Array

Raw pixel data (row-major, channel-interleaved).

width

number

Image width in pixels.

height

number

Image height in pixels.

channels

Number of channels: 3 (RGB) or 4 (RGBA).

3 | 4

Returns

Uint8Array

Grayscale pixel data (1 byte per pixel).