ftp.nice.ch/pub/next/unix/graphics/ImageMagick.3.8.6.s.tar.gz#/ImageMagick/magick/gems.h

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/*
  Graphic gems define declarations.
*/
extern Quantum
  GenerateNoise(Quantum,NoiseType);
   
RunlengthPacket
  Interpolate(Image *,RunlengthPacket *,double,double);

unsigned int
  InsidePrimitive(PrimitiveInfo *,AnnotateInfo *,int,int,Image *);

void
  Contrast(const int,Quantum *,Quantum *,Quantum *),
  HSLTransform(double,const double,const double,Quantum *,Quantum *,Quantum *),
  Hull(int,int,int,unsigned int,unsigned int,Quantum *,Quantum *),
  Modulate(double,double,double,Quantum *,Quantum *,Quantum *),
  TransformHSL(const Quantum,const Quantum,const Quantum,double *,double *,
    double *),
  Upsample(unsigned int,unsigned int,unsigned int,unsigned char *);

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.