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Add support for bicubic and Nohalo interpolation #41

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Lovell Fuller
2014-06-08 20:46:03 +01:00
parent f0a9d82bf7
commit 4eb910fec9
5 changed files with 110 additions and 6 deletions
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README.md
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@@ -53,7 +53,7 @@ Compiling from source is recommended:
cd libvips
git checkout 7.38
./bootstrap.sh
./configure --enable-debug=no --enable-cxx=no --without-python --without-orc
./configure --enable-debug=no --enable-cxx=yes --without-python --without-orc
make
sudo make install
sudo ldconfig
@@ -100,8 +100,8 @@ sharp('input.png').rotate(180).resize(300).sharpen().quality(90).webp().then(fun
```
```javascript
sharp(inputBuffer).resize(200, 300).embedWhite().toFile('output.tiff').then(function() {
// output.tiff is a 200 pixels wide and 300 pixels high image containing a scaled
sharp(inputBuffer).resize(200, 300).bicubicInterpolation().embedWhite().toFile('output.tiff').then(function() {
// output.tiff is a 200 pixels wide and 300 pixels high image containing a bicubic scaled
// version, embedded on a white canvas, of the image data in buffer
});
```
@@ -176,6 +176,18 @@ This is equivalent to GraphicsMagick's `>` geometry option: "change the dimensio
Perform a mild sharpen of the resultant image. This typically reduces performance by 30%.
### bilinearInterpolation()
Use [bilinear interpolation](http://en.wikipedia.org/wiki/Bilinear_interpolation) for image resizing, the default (and fastest) interpolation if none is specified.
### bicubicInterpolation()
Use [bicubic interpolation](http://en.wikipedia.org/wiki/Bicubic_interpolation) for image resizing. This typically reduces performance by 5%.
### nohaloInterpolation()
Use [Nohalo interpolation](http://eprints.soton.ac.uk/268086/) for image resizing. This typically reduces performance by a factor of 2.
### progressive()
Use progressive (interlace) scan for JPEG and PNG output. This typically reduces compression performance by 30% but results in an image that can be rendered sooner when decompressed.