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note libspng in optional deps

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John Cupitt 2020-12-27 16:26:38 +00:00
parent 59ea801627
commit 3e8c493522
1 changed files with 7 additions and 1 deletions
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README.md
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@ -214,9 +214,15 @@ If libvips finds this library, it uses it for fourier transforms.
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
are available for transforming images with ICC profiles.
### libspng
If present, libvips will load PNG files using libspng. At the moment, libpng
is still necessary for save.
### libpng
If present, libvips can load and save png files.
If libspng is not present and libpng is, libvips will load PNG files with
libpng. It will always save PNG files with libpng.
### libimagequant