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Combine new tile* API methods

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Use v7.40.0+ libvips loader methods

Separate Openslide as input vs Deep Zoom as output

Split tile-based tests into new file

Added assertions for generated tile size
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Lovell Fuller
2015-03-12 15:39:27 +00:00
parent 2d1e6f2644
commit 5781a23a4d
11 changed files with 314 additions and 215 deletions
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README.md
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@@ -12,7 +12,11 @@
The typical use case for this high speed Node.js module is to convert large images of many formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.
This module supports reading and writing JPEG, PNG and WebP images to and from Streams, Buffer objects and the filesystem.
It also supports reading images of many other types from the filesystem via libmagick, libgraphicsmagick or [OpenSlide](http://openslide.org/) if present and writing Deep Zoom images.
It also supports reading images of many other formats from the filesystem via libmagick, libgraphicsmagick or [OpenSlide](http://openslide.org/) if present.
Deep Zoom image pyramids can be generated, suitable for use with "slippy map" tile viewers like
[OpenSeadragon](https://github.com/openseadragon/openseadragon) and [Leaflet](https://github.com/turban/Leaflet.Zoomify).
Colour spaces, embedded ICC profiles and alpha transparency channels are all handled correctly.
Only small regions of uncompressed image data are held in memory and processed at a time, taking full advantage of multiple CPU cores and L1/L2/L3 cache. Resizing an image is typically 4x faster than using the quickest ImageMagick and GraphicsMagick settings.
@@ -498,6 +502,13 @@ Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
The default behaviour is to strip all metadata and convert to the device-independent sRGB colour space.
#### tile([size], [overlap])
The size and overlap, in pixels, of square Deep Zoom image pyramid tiles.
* `size` is an integral Number between 1 and 8192. The default value is 256 pixels.
* `overlap` is an integral Number between 0 and 8192. The default value is 0 pixels.
#### withoutChromaSubsampling()
Disable the use of [chroma subsampling](http://en.wikipedia.org/wiki/Chroma_subsampling) with JPEG output (4:4:4).
@@ -519,12 +530,6 @@ _Requires libvips 7.42.0+_
An advanced setting to disable adaptive row filtering for the lossless PNG output format.
#### tileSize(tileSize)
Setting the tile_size when DZI output format is selected. Default is 256.
#### tileOverlap(tileOverlap)
Setting the overlap when DZI output format is selected. Default is 0.
### Output methods
#### toFile(filename, [callback])