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fast, lightweight, zero-dependency BMP image encoder/decoder written in pure JavaScript.","maintainers":[{"name":"nktkas","email":"npmjs.kvd21@passinbox.com"}],"readme":"# BMP Encoder/Decoder\n\n[](https://www.npmjs.com/package/@nktkas/bmp)\n[](https://jsr.io/@nktkas/bmp)\n[](https://bundlejs.com/?q=@nktkas/bmp)\n\nA fast, lightweight, zero-dependency BMP image encoder/decoder written in pure JavaScript.\n\nWorks with:\n![\"browsers\"](\"https://jsr.io/logos/browsers.svg\" "\\"This")
\n![\"Bun\"](\"https://jsr.io/logos/bun.svg\" "\\"This")
\n![\"Deno\"](\"https://jsr.io/logos/deno.svg\" "\\"This")
\n![\"Node.js\"](\"https://jsr.io/logos/node.svg\" "\\"This")
\n![\"Cloudflare](\"https://jsr.io/logos/cloudflare-workers.svg\" "\\"This")
\n\n## Usage\n\n### Decode\n\nSupported BMP formats:\n\n- **Header types**: BITMAPCOREHEADER, OS22XBITMAPHEADER, BITMAPINFOHEADER, BITMAPV2–V5\n- **Compression**: BI_RGB, BI_RLE8, BI_RLE4, BI_BITFIELDS, BI_ALPHABITFIELDS, Modified Huffman, RLE24\n- **Bit depths**: 1, 2, 4, 8, 16, 24, 32, 64\n- **Row order**: top-down and bottom-up\n\nFull list of supported BMP formats [here](https://entropymine.com/jason/bmpsuite/bmpsuite/html/bmpsuite.html)\n\n#### Basic usage\n\n```ts\nimport { decode } from \"@nktkas/bmp\";\n\nconst file = new Uint8Array([/* ... BMP file bytes ... */]);\nconst raw = decode(file);\n// { width: 1, height: 1, channels: 3, data: Uint8Array(3) [0, 0, 0] }\n// ^\n// may be 1 (grayscale), 3 (RGB), or 4 (RGBA)\n```\n\n#### BI_JPEG / BI_PNG compressed images\n\nBMP files can embed JPEG or PNG data as pixel payload. Use `extractCompressedData` to get the embedded data, then decode\nit with any JPEG/PNG library.\n\n```ts\nimport { extractCompressedData } from \"@nktkas/bmp\";\n\nconst bmp = new Uint8Array([/* ... BMP file bytes with BI_PNG compression ... */]);\nconst extracted = extractCompressedData(bmp);\n// { width: 1, height: 1, compression: 5, data: Uint8Array(69) [...] }\n// ^\n// 4 = BI_JPEG, 5 = BI_PNG\n\n// Then decode with any JPEG/PNG library\nimport sharp from \"sharp\";\nconst raw = await sharp(extracted.data).raw().toBuffer();\n```\n\n### Encode\n\nSupported encoding formats:\n\n- **Bit depths**: 1, 4, 8, 16, 24, 32\n- **Compression**: BI_RGB, BI_RLE8, BI_RLE4, BI_BITFIELDS, BI_ALPHABITFIELDS\n- **Header types**: BITMAPINFOHEADER, BITMAPV4HEADER, BITMAPV5HEADER\n- **Row order**: top-down and bottom-up\n\n#### Basic usage\n\n\n```ts\nimport { encode } from \"@nktkas/bmp\";\n\n// A minimal raw image\nconst raw = {\n width: 2,\n height: 2,\n channels: 3, // 1 (grayscale), 3 (RGB), or 4 (RGBA)\n data: new Uint8Array([ // 2x2 black and white pixels\n 0, 0, 0, 255, 255, 255,\n 0, 0, 0, 255, 255, 255,\n ]),\n} as const;\n\n// Encode to 24-bit BMP (automatic detection of best settings based on raw data)\nconst bmp = encode(raw);\n// ^^^\n// Uint8Array([...]) containing the BMP file bytes\n```\n\n#### Advanced options\n\n```ts\ninterface EncodeOptions {\n /**\n * Bit depth to encode at.\n *\n * @default Follows `raw.channels`: 8 for grayscale, 24 for RGB, 32 for RGBA.\n */\n bitsPerPixel?: 1 | 4 | 8 | 16 | 24 | 32;\n\n /**\n * Compression method:\n * - `0`: BI_RGB, uncompressed.\n * - `1`: BI_RLE8, run-length encoded, 8bpp only.\n * - `2`: BI_RLE4, run-length encoded, 4bpp only.\n * - `3`: BI_BITFIELDS, channel masks, 16 or 32bpp.\n * - `6`: BI_ALPHABITFIELDS, channel masks with alpha, 32bpp only.\n *\n * @default 0\n */\n compression?: 0 | 1 | 2 | 3 | 6;\n\n /**\n * DIB header format to write:\n * - `BITMAPINFOHEADER` — 40 bytes, most compatible.\n * - `BITMAPV4HEADER` — 108 bytes, includes masks and sRGB color space.\n * - `BITMAPV5HEADER` — 124 bytes, adds ICC profile and rendering intent.\n *\n * @default \"BITMAPINFOHEADER\"\n */\n headerType?: HeaderType;\n\n /**\n * Store rows top-down instead of bottom-up.\n *\n * @default false\n */\n isTopDown?: boolean;\n\n /**\n * Palette for the indexed depths (1, 4, 8), holding at least as many colors as the depth addresses;\n * anything past that count is dropped. Omitting it quantizes the image down to a palette of its own.\n */\n palette?: Color[];\n\n /**\n * Channel masks for the two bitfield compressions.\n *\n * @default RGB565 at 16bpp, BGRA8888 at 32bpp.\n */\n bitfields?: BitfieldMasks;\n}\n```\n\n\n```ts\nimport { encode } from \"@nktkas/bmp\";\n\n// A minimal raw image\nconst raw = {\n width: 2,\n height: 2,\n channels: 3, // 1 (grayscale), 3 (RGB), or 4 (RGBA)\n data: new Uint8Array([ // 2x2 black and white pixels\n 0, 0, 0, 255, 255, 255,\n 0, 0, 0, 255, 255, 255,\n ]),\n} as const;\n\n// Encode to 8-bit indexed BMP with auto-generated 256-color palette\nconst bmp = encode(raw, { bitsPerPixel: 8 });\n// ^^^\n// Uint8Array([...]) containing the BMP file bytes\n```\n\n### Errors\n\nEvery failure is a `BmpError` with a `code`. An error raised outside the package is wrapped in one of these, with the\noriginal in `cause`.\n\n```ts\nimport { BmpError, decode, extractCompressedData } from \"@nktkas/bmp\";\n\nconst file = await Deno.readFile(\"image.bmp\");\n\ntry {\n const raw = decode(file);\n} catch (error) {\n if (!(error instanceof BmpError)) throw error;\n if (error.code !== \"EMBEDDED_IMAGE\") throw error;\n\n const { data, compression } = extractCompressedData(file);\n}\n```\n\n| Code | Thrown by | Meaning |\n| ------------------------- | :---------------: | ------------------------------------------------------------------------------- |\n| `INVALID_SIGNATURE` | `decode` | The bytes do not begin with a BMP file header. |\n| `UNSUPPORTED_HEADER` | `decode` | The DIB header size matches no BMP header version this package reads. |\n| `UNSUPPORTED_DEPTH` | `decode` | The BMP format defines no pixel layout for this depth under this compression. |\n| `UNSUPPORTED_COMPRESSION` | `decode` | The compression method is one this package does not implement. |\n| `EMBEDDED_IMAGE` | `decode` | The pixel data is a complete JPEG or PNG; `extractCompressedData` returns it. |\n| `MALFORMED_FILE` | `decode` | The file is shorter than its header declares; `cause` holds the original error. |\n| `INVALID_DATA_SIZE` | `encode` | The pixel buffer length is not width × height × channels. |\n| `INCOMPATIBLE_OPTIONS` | `encode` | The given depth, compression, row order and palette do not fit together. |\n| `INVALID_DIMENSIONS` | `decode`,`encode` | The dimensions are not positive, or too large to allocate a buffer for. |\n\n## Benchmarks\n\nAll benchmarks run on procedurally generated 1024×1024 images.\n\nMilliseconds per operation (lower is better). **Bold** = fastest in row, `—` = unsupported.\n\n### Decode comparison\n\nRun command: `deno bench --allow-read bench/decode.bench.ts`\n\n| Format | @nktkas/bmp | [@cwasm/nsbmp](https://www.npmjs.com/package/@cwasm/nsbmp) (WASM) | [bmpimagejs](https://www.npmjs.com/package/bmpimagejs) | [bmp-js](https://www.npmjs.com/package/bmp-js) | [fast-bmp](https://www.npmjs.com/package/fast-bmp) | [bmp-ts](https://www.npmjs.com/package/bmp-ts) |\n| ----------------- | :---------: | :---------------------------------------------------------------: | :----------------------------------------------------: | :--------------------------------------------: | :------------------------------------------------: | :--------------------------------------------: |\n| BI_RGB 1-bit | **1.4** | 2.4 | 2.7 | 2.8 | — | 3.5 |\n| BI_RGB 1-bit (gs) | **0.74** | 2.5 | 2.7 | 2.8 | — | 3.5 |\n| BI_RGB 4-bit | **1.3** | 2.2 | 2.7 | 4.1 | — | 4.2 |\n| BI_RGB 4-bit (gs) | **0.47** | 1.9 | 2.3 | 3.8 | — | 4.2 |\n| BI_RGB 8-bit | **1.1** | 1.7 | 2.5 | 4.4 | — | 6.2 |\n| BI_RGB 8-bit (gs) | **0.56** | 1.7 | 2.6 | 4.4 | 2.3 | 6.3 |\n| BI_RGB 16-bit | 1.6 | **1.5** | — | 2.2 | — | 12.0 |\n| BI_RGB 24-bit | **1.1** | 1.4 | 2.2 | 2.4 | 4.4 | 6.0 |\n| BI_RGB 32-bit | **1.0** | 1.6 | 1.4 | 5.8 | — | 12.9 |\n| BI_RLE4 | **0.81** | 0.85 | 0.99 | — | — | — |\n| BI_RLE8 | **0.70** | 0.72 | 0.91 | — | — | — |\n| BI_RLE8 (gs) | **0.22** | 1.2 | 1.2 | — | — | — |\n| BI_BITFIELDS 16 | **1.5** | 4.6 | — | — | — | 12.1 |\n| BI_BITFIELDS 32 | **1.9** | 4.3 | 4.0 | — | — | — |\n\n### Encode comparison\n\nRun command: `deno bench bench/encode.bench.ts`\n\n| Format | @nktkas/bmp | [fast-bmp](https://www.npmjs.com/package/fast-bmp) | [bmp-js](https://www.npmjs.com/package/bmp-js) |\n| ----------------- | :---------: | :------------------------------------------------: | :--------------------------------------------: |\n| BI_RGB 1-bit | 12.2 | — | — |\n| BI_RGB 1-bit (gs) | 0.74 | — | — |\n| BI_RGB 4-bit | 9.6 | — | — |\n| BI_RGB 4-bit (gs) | 0.89 | — | — |\n| BI_RGB 8-bit | 38.4 | — | — |\n| BI_RGB 8-bit (gs) | **0.08** | 3.4 | — |\n| BI_RGB 16-bit | 1.3 | — | — |\n| BI_RGB 24-bit | **1.3** | 8.2 | 1.4 |\n| BI_RGB 32-bit | 1.3 | — | — |\n| BI_RLE4 | 9.6 | — | — |\n| BI_RLE8 | 11.7 | — | — |\n| BI_RLE8 (gs) | 2.2 | — | — |\n| BI_BITFIELDS 16 | 1.8 | — | — |\n| BI_BITFIELDS 32 | 4.0 | — | — |\n\n## License\n\n**@nktkas/bmp** is licensed under the [MIT License](LICENSE).\n\nCopyright © 2025-present [nktkas](https://github.com/nktkas).\n","readmeFilename":"README.md"}