🚀 go-pugleaf

This sounds like something that should be done with a transfer
function, not modifying the code...

Aandi Inston

Hey Aandi, 
I did write a transfer function, and it works well while in the PS files themselves, meaning in the VM. 
However, I would like to use it directly either in the PPD file or by changing persistent parameters in the non-volatile memory of the printer. 
I wasn't able to change either of them, this is my problem. 

Micky

It can be difficult to do things with PPD files that weren't planned;
for instance changing the default in a PPD sounds as though it should
have the effect of setting that value, but it may have the opposite
effect, since the default is intended to tell the driver what the
printer's default actually is, and so it does not need to set it.

If your PPD consumer supports the "patch file" feature that may be the
safest bet.  Bear in mind a transfer function has to be set at the
start of each page.

Aandi Inston

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 

I have included these two lines at the beginning of PS files and the output was changed to a lighter one as desired. 

I have indluded these two lines also in the startup directory of the Adobe Acrobat Distiller and the output was changed as well. 

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

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

Micky

>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