add note about libheif config to README
see eg. https://github.com/libvips/libvips/issues/1964
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README.md
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README.md
@ -212,7 +212,7 @@ If libvips finds this library, it uses it for fourier transforms.
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### lcms2
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### lcms2
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If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
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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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can be used to manipulate images with ICC profiles.
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### libspng
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### libspng
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@ -279,7 +279,22 @@ files: Aperio, Hamamatsu, Leica, MIRAX, Sakura, Trestle, and Ventana.
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### libheif
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### libheif
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If available, libvips can load and save HEIC and AVIF images.
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If available, libvips can load and save HEIC and AVIF images. Your libheif (in
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turn) needs to be built with the correct decoders and encoders. You can check
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with eg.:
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```
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$ pkg-config libheif --print-variables
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builtin_avif_decoder
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builtin_avif_encoder
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builtin_h265_decoder
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builtin_h265_encoder
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exec_prefix
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includedir
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libdir
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pcfiledir
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prefix
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```
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# Contributors
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# Contributors
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