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add quant note to readme

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John Cupitt 2021-11-21 11:39:52 +00:00
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README.md
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@ -227,15 +227,16 @@ is still necessary for save.
If libspng is not present and libpng is, libvips will load PNG files with If libspng is not present and libpng is, libvips will load PNG files with
libpng. It will always save PNG files with libpng. libpng. It will always save PNG files with libpng.
### libimagequant ### libimagequant, quantizr
If present, libvips can write 8-bit palette-ised PNGs. If one of these quantisation packages is present, libvips can write 8-bit
palette-ised PNGs and GIFs.
### ImageMagick, or optionally GraphicsMagick ### ImageMagick, or optionally GraphicsMagick
If available, libvips adds support for loading all libMagick-supported If available, libvips adds support for loading and
image file types. Use `--with-magickpackage=GraphicsMagick` to build against saving all libMagick-supported image file types. Use
graphicsmagick instead. `--with-magickpackage=GraphicsMagick` to build against graphicsmagick instead.
Imagemagick 6.9+ needs to have been built with `--with-modules`. Most packaged Imagemagick 6.9+ needs to have been built with `--with-modules`. Most packaged
IMs are, I think. IMs are, I think.