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82 lines
3.2 KiB
Markdown
82 lines
3.2 KiB
Markdown
<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
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### Table of Contents
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- [overlayWith][1]
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- [Parameters][2]
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- [Examples][3]
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## overlayWith
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Overlay (composite) an image over the processed (resized, extracted etc.) image.
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The overlay image must be the same size or smaller than the processed image.
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If both `top` and `left` options are provided, they take precedence over `gravity`.
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If the overlay image contains an alpha channel then composition with premultiplication will occur.
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### Parameters
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- `overlay` **([Buffer][4] \| [String][5])** Buffer containing image data or String containing the path to an image file.
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- `options` **[Object][6]?**
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- `options.gravity` **[String][5]** gravity at which to place the overlay. (optional, default `'centre'`)
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- `options.top` **[Number][7]?** the pixel offset from the top edge.
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- `options.left` **[Number][7]?** the pixel offset from the left edge.
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- `options.tile` **[Boolean][8]** set to true to repeat the overlay image across the entire image with the given `gravity`. (optional, default `false`)
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- `options.cutout` **[Boolean][8]** set to true to apply only the alpha channel of the overlay image to the input image, giving the appearance of one image being cut out of another. (optional, default `false`)
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- `options.density` **[Number][7]** integral number representing the DPI for vector overlay image. (optional, default `72`)
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- `options.raw` **[Object][6]?** describes overlay when using raw pixel data.
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- `options.raw.width` **[Number][7]?**
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- `options.raw.height` **[Number][7]?**
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- `options.raw.channels` **[Number][7]?**
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- `options.create` **[Object][6]?** describes a blank overlay to be created.
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- `options.create.width` **[Number][7]?**
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- `options.create.height` **[Number][7]?**
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- `options.create.channels` **[Number][7]?** 3-4
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- `options.create.background` **([String][5] \| [Object][6])?** parsed by the [color][9] module to extract values for red, green, blue and alpha.
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### Examples
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```javascript
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sharp('input.png')
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.rotate(180)
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.resize(300)
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.flatten()
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.background('#ff6600')
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.overlayWith('overlay.png', { gravity: sharp.gravity.southeast } )
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.sharpen()
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.withMetadata()
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.quality(90)
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.webp()
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.toBuffer()
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.then(function(outputBuffer) {
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// outputBuffer contains upside down, 300px wide, alpha channel flattened
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// onto orange background, composited with overlay.png with SE gravity,
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// sharpened, with metadata, 90% quality WebP image data. Phew!
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});
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```
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- Throws **[Error][10]** Invalid parameters
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Returns **Sharp**
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[1]: #overlaywith
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[2]: #parameters
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[3]: #examples
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[4]: https://nodejs.org/api/buffer.html
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[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String
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[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
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[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number
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[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean
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[9]: https://www.npmjs.org/package/color
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[10]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Error
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