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133 lines
3.4 KiB
Markdown
133 lines
3.4 KiB
Markdown
## tint
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Tint the image using the provided chroma while preserving the image luminance.
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An alpha channel may be present and will be unchanged by the operation.
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**Throws**:
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- <code>Error</code> Invalid parameter
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| Param | Type | Description |
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| --- | --- | --- |
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| rgb | <code>string</code> \| <code>Object</code> | parsed by the [color](https://www.npmjs.org/package/color) module to extract chroma values. |
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**Example**
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```js
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const output = await sharp(input)
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.tint({ r: 255, g: 240, b: 16 })
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.toBuffer();
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```
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## greyscale
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Convert to 8-bit greyscale; 256 shades of grey.
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This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use `gamma()` with `greyscale()` for the best results.
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By default the output image will be web-friendly sRGB and contain three (identical) color channels.
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This may be overridden by other sharp operations such as `toColourspace('b-w')`,
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which will produce an output image containing one color channel.
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An alpha channel may be present, and will be unchanged by the operation.
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| Param | Type | Default |
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| --- | --- | --- |
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| [greyscale] | <code>Boolean</code> | <code>true</code> |
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**Example**
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```js
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const output = await sharp(input).greyscale().toBuffer();
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```
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## grayscale
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Alternative spelling of `greyscale`.
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| Param | Type | Default |
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| --- | --- | --- |
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| [grayscale] | <code>Boolean</code> | <code>true</code> |
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## pipelineColourspace
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Set the pipeline colourspace.
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The input image will be converted to the provided colourspace at the start of the pipeline.
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All operations will use this colourspace before converting to the output colourspace,
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as defined by [toColourspace](#tocolourspace).
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This feature is experimental and has not yet been fully-tested with all operations.
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**Throws**:
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- <code>Error</code> Invalid parameters
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**Since**: 0.29.0
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| Param | Type | Description |
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| --- | --- | --- |
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| [colourspace] | <code>string</code> | pipeline colourspace e.g. `rgb16`, `scrgb`, `lab`, `grey16` [...](https://github.com/libvips/libvips/blob/41cff4e9d0838498487a00623462204eb10ee5b8/libvips/iofuncs/enumtypes.c#L774) |
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**Example**
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```js
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// Run pipeline in 16 bits per channel RGB while converting final result to 8 bits per channel sRGB.
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await sharp(input)
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.pipelineColourspace('rgb16')
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.toColourspace('srgb')
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.toFile('16bpc-pipeline-to-8bpc-output.png')
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```
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## pipelineColorspace
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Alternative spelling of `pipelineColourspace`.
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**Throws**:
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- <code>Error</code> Invalid parameters
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| Param | Type | Description |
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| [colorspace] | <code>string</code> | pipeline colorspace. |
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## toColourspace
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Set the output colourspace.
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By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
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**Throws**:
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- <code>Error</code> Invalid parameters
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| Param | Type | Description |
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| [colourspace] | <code>string</code> | output colourspace e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...](https://github.com/libvips/libvips/blob/3c0bfdf74ce1dc37a6429bed47fa76f16e2cd70a/libvips/iofuncs/enumtypes.c#L777-L794) |
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**Example**
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```js
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// Output 16 bits per pixel RGB
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await sharp(input)
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.toColourspace('rgb16')
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.toFile('16-bpp.png')
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```
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## toColorspace
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Alternative spelling of `toColourspace`.
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**Throws**:
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- <code>Error</code> Invalid parameters
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| Param | Type | Description |
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| --- | --- | --- |
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| [colorspace] | <code>string</code> | output colorspace. | |