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✏️ Editing: stcolor.ps

% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% stcolor.ps
% Epson Stylus-Color Printer-Driver

% The purpose of this file is to configure the stcolor-printer driver

%
% It is useless and dangerous to interpret the following code with anything
% else than Ghostscript, so this condition is verified first. If this fails
% a message is send to the output. If this message bothers you, remove it,
% but I prefer to know why the device-setup failed.

statusdict begin product end
dup (Ghostscript) eq 1 index (Artifex Ghostscript) eq or
exch (AFPL Ghostscript) eq or{

% fetch the current device-parameters this is specific for Ghostscript.

/STCold currentdevice getdeviceprops .dicttomark def

% Any Ghostscript-Driver has a Name, verify that the selected device is
% stcolor, otherwise nothing than another message will be produced.

STCold /Name get (stcolor) eq {

%
% The main thing this file does, is to establish transfer-functions.
% Here are two predefined arrays for 360x360Dpi and for 720x720DpI.
% If resolution is 360x720 or 720x360 the average is used. You may
% want to define other arrays here.
%

/STCdeftransfer [ 0.0 1.0 ] def

/STCKtransfer360 [
       0.0000 0.0034 0.0185 0.0377 0.0574 0.0769 0.0952 0.1147
       0.1337 0.1540 0.1759 0.1985 0.2209 0.2457 0.2706 0.2949
       0.3209 0.3496 0.3820 0.4145 0.4505 0.4907 0.5344 0.5840
       0.6445 0.7093 0.8154 0.9816 0.9983 0.9988 0.9994 1.0000
     ] def

/STCKtransfer720 [
       0.0000 0.0011 0.0079 0.0151 0.0217 0.0287 0.0354 0.0425
       0.0492 0.0562 0.0633 0.0700 0.0766 0.0835 0.0900 0.0975
       0.1054 0.1147 0.1243 0.1364 0.1489 0.1641 0.1833 0.2012
       0.2217 0.2492 0.2814 0.3139 0.3487 0.3996 0.4527 0.5195
     ] def

% compute the resolution

STCold /HWResolution get dup
     0 get exch 1 get mul sqrt /STCdpi exch def

% pick the colormodel
     STCold /ProcessColorModel get /STCcolor exch def

mark % prepare stack for "putdeviceprops"

% warn for BitsPerPixel=30 with fsrgb
     STCcolor /DeviceRGB eq STCold /BitsPerPixel get 32 eq and
     {
       (%%[ stcolor.ps: inefficient RGB-setup, recommend BitsPerPixel=24 ]%%\n)
       print
      } if

% if the Dithering-Method is default (gscmyk), change it to fscmyk
% this is achieved by pushing a name/value-pair onto the stack
% if the selected algorithm uses another ProcessColorModel, it is necessary
% to change the Value of STCcolor according to the new algorithm.

STCold /Dithering get (gscmyk) eq
     {
        /Dithering (hscmyk) % preferred dithering-method
     } if % might be necessary to change STCcolor too

%
% select the array according to the resolution
%
     STCdpi 359.0 lt
     { STCdeftransfer }
     { STCdpi 361.0 lt
       { STCKtransfer360 }
       { STCdpi 719.0 gt
         { STCKtransfer720 }
         {
           STCKtransfer360 length STCKtransfer720 length eq
           {
             0 1 STCKtransfer360 length 1 sub
             {
               dup dup
               STCKtransfer360 exch get
               exch STCKtransfer720 exch get
               add 2.0 div
               STCKtransfer360 3 1 roll put
             } for
           }if
           STCKtransfer360
         } ifelse
       }ifelse
     } ifelse
     /STCtransfer exch def

%
% Add the arrays. With Version 1.17 and above, it seems to be
% a good idea, to use the transfer-arrays as coding-arrays too.
%

%
% RGB-Model requires inversion of the transfer-arrays
%
     STCcolor /DeviceRGB eq
     {
        /RGBtransfer STCtransfer length array def
        0 1 STCtransfer length 1 sub
        {
          dup RGBtransfer length 1 sub exch sub exch
          STCtransfer exch get 1.0 exch sub
          RGBtransfer 3 1 roll put
        } for

/Rtransfer RGBtransfer
        /Gtransfer RGBtransfer
        /Btransfer RGBtransfer

/Rcoding   RGBtransfer
        /Gcoding   RGBtransfer
        /Bcoding   RGBtransfer

}{

/Ctransfer STCtransfer
       /Mtransfer STCtransfer
       /Ytransfer STCtransfer
       /Ktransfer STCtransfer

/Ccoding   STCtransfer
       /Mcoding   STCtransfer
       /Ycoding   STCtransfer
       /Kcoding   STCtransfer

} ifelse

counttomark 0 ne
        {currentdevice putdeviceprops pop}{cleartomark}ifelse

% decativate predefined correction

{} dup dup currenttransfer setcolortransfer

}{
    (%%[ stcolor.ps: currentdevice is not stcolor - ignored ]%%\n) print
  } ifelse
}{
  (%%[ stcolor.ps: not interpreted by AFPL Ghostscript - ignored ]%%\n) print
} ifelse

MR SKB