sethalftone

I have problem with sethalftone in the following script can someone let me know wats wrong with the script!

% ! PS

/mycolorhalftone 6 dict def

mycolorhalftone start

/ Cyan < <

/ HalftoneType 1

Engine 150

/Angle 15

/ SpotFunction {dup mul exch dup mul add 1 exch sub}

> > def

/ Magenta < <

/ HalftoneType 1

Engine 150

/Angle 105

/ SpotFunction {dup mul exch dup mul add 1 exch sub}

> > def

/ Yellow < <

/ HalftoneType 1

Engine 150

/Angle 90

/ SpotFunction {dup mul exch dup mul add 1 exch sub}

> > def

/ Black < <

/ HalftoneType 1

Engine 150

/Angle 45

/ SpotFunction {dup mul exch dup mul add 1 exch sub}

> > def

/ Default < <

/ HalftoneType 1

Engine 150

/Angle 45

/ SpotFunction {dup mul exch dup mul add 1 exch sub}

> > def

end

mycolorhalftone sethalftone

It's in the color Cyan for example dicts., but absent from the dict mycolorhalftone for example

% ! PS

/mycolorhalftone 6 dict def

mycolorhalftone start

/ 5 HalftoneType def % NEW

/ Cyan

Tags: Adobe PostScript

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