🚀 go-pugleaf

>Hey Aandi, 
>I belong to a research field and am interested in the different methods to change the output by tranfer functions. 
>I have written a setgray tranfer function. A much simpler version of my tranfer function is as followed: 
>
>/NEWsetgray {setgray} bind def 
>
>/setgray {0.5 exp  NEWsetgray } def 

That's not a transfer function!

See the PostScript language reference for the definition of a transfer
function.

>Now I am interested in including these two lines in the PPD file of the printer and to see the effect.  

See my previous advice about the patch file feature.

>I also like to see the effect of saving these two lines directly in the printer memory, maybe using exitserver operator and changing statusdict. 

You could probably do that.  Do remember that many jobs will set
colours in other ways, and that you are not affecting images. Hence,
the recommendation to use a real transfer function.

Aandi Inston