vipsthumbnail shrinks to a scanline cache
vipsthumbnail shrinks to a scanline cache

so it works well with the new :seq mode for png

wishabi/libvips,leiyangyou/libvips,leiyangyou/libvips,lovell/libvips,mcanthony/libvips,leiyangyou/libvips,jcupitt/libvips,wishabi/libvips,mcanthony/libvips,lovell/libvips,jcupitt/libvips,wishabi/libvips,mcanthony/libvips,lovell/libvips,lovell/libvips,leiyangyou/libvips,mcanthony/libvips,jcupitt/libvips,jcupitt/libvips,wishabi/libvips