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# tiff [](https://www.npmjs.com/package/tiff) [](https://www.npmjs.com/package/tiff) [](https://codecov.io/gh/image-js/tiff) [](https://github.com/image-js/tiff/blob/main/LICENSE) TIFF image decoder written entirely in JavaScript. ## Installation ```console npm install tiff ``` ## Compatibility ### [TIFF standard](./TIFF6.pdf) The library can currently decode greyscale and RGB images (8, 16 or 32 bits). It supports LZW compression and images with an additional alpha channel. ### Extensions Images compressed with Zlib/deflate algorithm are also supported. ## API ### [Complete API documentation](https://image-js.github.io/tiff/) ### `tiff.decode(data[, options])` Decodes the file and returns TIFF IFDs. #### IFD object Each decoded image is stored in an `IFD`. ##### IFD#data The `data` property is a Typed Array containing the pixel data. It is a `Uint8Array` for 8bit images, a `Uint16Array` for 16bit images and a `Float32Array` for 32bit images. ##### Other properties of IFD - `size` - number of pixels - `width` - number of columns - `height` - number of rows - `bitsPerSample` - bit depth - `alpha` - `true` if the image has an additional alpha channel - `xResolution` - `yResolution` - `resolutionUnit` ### `tiff.pageCount(data)` Returns the number of IFDs (pages) in the file. ### `tiff.isMultiPage(data)` Returns true if the file has 2 or more IFDs (pages) and false if it has 1. This is slightly more efficient than calling `pageCount()` if all you need to know is whether the file has multiple pages or not. ## License [MIT](./LICENSE)