note libspng in optional deps
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@ -214,9 +214,15 @@ If libvips finds this library, it uses it for fourier transforms.
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If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
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are available for transforming images with ICC profiles.
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### libspng
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If present, libvips will load PNG files using libspng. At the moment, libpng
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is still necessary for save.
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### libpng
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If present, libvips can load and save png files.
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If libspng is not present and libpng is, libvips will load PNG files with
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libpng. It will always save PNG files with libpng.
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### libimagequant
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