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Docs: clarify that metadata respects page/pages

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Lovell Fuller 2022-09-01 09:58:17 +01:00
parent 4b38f56d02
commit 0e3bd46ca3
2 changed files with 21 additions and 13 deletions
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31
docs/api-input.md
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@ -7,15 +7,18 @@ Fast access to (uncached) image metadata without decoding any compressed pixel d
This is taken from the header of the input image.
It does not include operations, such as resize, to be applied to the output image.
Dimensions in the response will respect the `page` and `pages` properties of the
[constructor parameters][1].
A `Promise` is returned when `callback` is not provided.
* `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
* `size`: Total size of image in bytes, for Stream and Buffer input only
* `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
* `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][1]
* `space`: Name of colour space interpretation e.g. `srgb`, `rgb`, `cmyk`, `lab`, `b-w` [...][2]
* `channels`: Number of bands e.g. `3` for sRGB, `4` for CMYK
* `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...][2]
* `depth`: Name of pixel depth format e.g. `uchar`, `char`, `ushort`, `float` [...][3]
* `density`: Number of pixels per inch (DPI), if present
* `chromaSubsampling`: String containing JPEG chroma subsampling, `4:2:0` or `4:4:4` for RGB, `4:2:0:4` or `4:4:4:4` for CMYK
* `isProgressive`: Boolean indicating whether the image is interlaced using a progressive scan
@ -33,14 +36,14 @@ A `Promise` is returned when `callback` is not provided.
* `hasAlpha`: Boolean indicating the presence of an alpha transparency channel
* `orientation`: Number value of the EXIF Orientation header, if present
* `exif`: Buffer containing raw EXIF data, if present
* `icc`: Buffer containing raw [ICC][3] profile data, if present
* `icc`: Buffer containing raw [ICC][4] profile data, if present
* `iptc`: Buffer containing raw IPTC data, if present
* `xmp`: Buffer containing raw XMP data, if present
* `tifftagPhotoshop`: Buffer containing raw TIFFTAG\_PHOTOSHOP data, if present
### Parameters
* `callback` **[Function][4]?** called with the arguments `(err, metadata)`
* `callback` **[Function][5]?** called with the arguments `(err, metadata)`
### Examples
@ -75,7 +78,7 @@ function getNormalSize({ width, height, orientation }) {
}
```
Returns **([Promise][5]<[Object][6]> | Sharp)**&#x20;
Returns **([Promise][6]<[Object][7]> | Sharp)**&#x20;
## stats
@ -103,7 +106,7 @@ written to a buffer in order to run `stats` on the result (see third example).
### Parameters
* `callback` **[Function][4]?** called with the arguments `(err, stats)`
* `callback` **[Function][5]?** called with the arguments `(err, stats)`
### Examples
@ -129,16 +132,18 @@ const part = await image.extract(region).toBuffer();
const stats = await sharp(part).stats();
```
Returns **[Promise][5]<[Object][6]>**&#x20;
Returns **[Promise][6]<[Object][7]>**&#x20;
[1]: https://www.libvips.org/API/current/VipsImage.html#VipsInterpretation
[1]: /api-constructor#parameters
[2]: https://www.libvips.org/API/current/VipsImage.html#VipsBandFormat
[2]: https://www.libvips.org/API/current/VipsImage.html#VipsInterpretation
[3]: https://www.npmjs.com/package/icc
[3]: https://www.libvips.org/API/current/VipsImage.html#VipsBandFormat
[4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
[4]: https://www.npmjs.com/package/icc
[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function
[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object
[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise
[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object

3
lib/input.js
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@ -390,6 +390,9 @@ function _isStreamInput () {
* This is taken from the header of the input image.
* It does not include operations, such as resize, to be applied to the output image.
*
* Dimensions in the response will respect the `page` and `pages` properties of the
* {@link /api-constructor#parameters|constructor parameters}.
*
* A `Promise` is returned when `callback` is not provided.
*
* - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`