How to convert image to CMYK (from any format)?

[Lorin Lochridge]

This seems like it should be pretty simple.

I tried to reverse engineer a function from the "Warn if RGB.jsx" found: applications/Adobe Photoshop CC 2015/ Presets/Scripts/Warn if RGB.jsx

in this file the image that is open in Photoshop is taken and converted to RGB.

Well that's exactly what I want to do, except the reverse.

How do I write code that would take my "current image" and change it to CMYK just as if I were to go into photoshop (GUI) Edit> Convert to Profile... > and select the CMYK bullet option under "Destination Space"

I need this in a function for other script I have.

I will past what I have (with my poor attempt at reverse engineering the "Warn if RGB.jsx" function in place.

Thank you. I could really use the help and I think this should be pretty straight forward.

try {
  var data = GetDataFromDocument( activeDocument );
  if ('eps' == data.extension.toLowerCase()) {
  //convert to cmyk
  Switch();
  }
  else{
  //run code to square up images
  toSquare();
  }
}
catch( e ) {
  alert(e);
}






//FUNCTIONS
///////////////////////////////////////////////
///////////////////////////////////////////////


function toSquare(){
  var savedRuler= app.preferences.rulerUnits;
  app.preferences.rulerUnits = Units.PIXELS;
  var w = app.activeDocument.width;
  var h = app.activeDocument.height;
  if(w>h) app.activeDocument.resizeCanvas (w, w, AnchorPosition.MIDDLECENTER);
  if(w<h) app.activeDocument.resizeCanvas (h, h, AnchorPosition.MIDDLECENTER);
  //if w==h already square
  app.preferences.rulerUnits = savedRuler;
}


///////////////////////////////////////////////


function GetDataFromDocument( inDocument ) {
  var data = new Object();
  var fullPathStr = inDocument.fullName.toString();
  var lastDot = fullPathStr.lastIndexOf( "." );
  var fileNameNoPath = fullPathStr.substr( 0, lastDot );
  data.extension = fullPathStr.substr( lastDot + 1, fullPathStr.length );
  var lastSlash = fullPathStr.lastIndexOf( "/" );
  data.fileName = fileNameNoPath.substr( lastSlash + 1, fileNameNoPath.length );
  data.folder = fileNameNoPath.substr( 0, lastSlash );
  data.fileType = inDocument.fullName.type;
  return data;
}


///////////////////////////////////////////////


function Switch() {
  var eventModeChange = stringIDToTypeID( "8cba8cd6-cb66-11d1-bc43-0060b0a13dc4" );
  var descSource = new ActionDescriptor();
  var keySourceMode = charIDToTypeID( "SrcM" );
  var list = new ActionList();
  var keyCondition = charIDToTypeID( "Cndn" );
  var keyBitmap = charIDToTypeID( "UBtm" );
  var keyGrayscale = charIDToTypeID( "UGry" );
  var keyDuotone = charIDToTypeID( "UDtn" );
  var keyIndex = charIDToTypeID( "UInd" );
  var keyRGB = charIDToTypeID( "URGB" );
  var keyCMYK = charIDToTypeID( "UCMY" );
  var keyLab = charIDToTypeID( "ULab" );
  var keyMultichannel = charIDToTypeID( "UMlt" );
  list.putEnumerated( keyCondition, keyBitmap );
  list.putEnumerated( keyCondition, keyGrayscale );
  list.putEnumerated( keyCondition, keyDuotone );
  list.putEnumerated( keyCondition, keyIndex );
  list.putEnumerated( keyCondition, keyRGB );
  list.putEnumerated( keyCondition, keyCMYK );
  list.putEnumerated( keyCondition, keyLab );
  list.putEnumerated( keyCondition, keyMultichannel );
  descSource.putList( keySourceMode, list );
  var keyDestination = charIDToTypeID( "DstM" );
  var descDest = new ActionDescriptor();
  var keyCMYK = charIDToTypeID( "UCMY" );
  descSource.putObject( keyDestination, keyRGB, descDest );
  executeAction( eventModeChange, descSource, DialogModes.NO );
}


//////////////////////////////////////////////
//////////////////////////////////////////////

[oliverIntergrafika]

function converToCMYK( rasterize )
{
    var idCnvM = charIDToTypeID( "CnvM" );
    var desc39 = new ActionDescriptor();
    var idT = charIDToTypeID( "T  " );
    var idCMYM = charIDToTypeID( "CMYM" );
    desc39.putClass( idT, idCMYM );
    var idMrge = charIDToTypeID( "Mrge" );
    desc39.putBoolean( idMrge, false );
    var idRstr = charIDToTypeID( "Rstr" );
    desc39.putBoolean( idRstr, rasterize );
    executeAction( idCnvM, desc39, DialogModes.NO );
}

converToCMYK ( rasterize = true ) ;

This code is copied from ScriptingListenerJS.log which is the output of the ScriptListener.8li plugin.

[Lorin Lochridge]

When I try this code, the resulting error is:

[oliverIntergrafika · Accepted solution]

Seems like the forum engine swallowing random whitespaces when we switch to advanced editor mode:

The exact line is this:

var idT = charIDToTypeID( "T   " );

There are 3 spaces after the T.

[Lorin Lochridge]

oliverIntergrafika wrote:

1. function converToCMYK( rasterize ) 
2. { 
3.     var idCnvM = charIDToTypeID( "CnvM" ); 
4.     var desc39 = new ActionDescriptor(); 
5.     var idT = charIDToTypeID( "T  " ); 
6.     var idCMYM = charIDToTypeID( "CMYM" ); 
7.     desc39.putClass( idT, idCMYM ); 
8.     var idMrge = charIDToTypeID( "Mrge" ); 
9.     desc39.putBoolean( idMrge, false ); 
10.     var idRstr = charIDToTypeID( "Rstr" ); 
11.     desc39.putBoolean( idRstr, rasterize ); 
12.     executeAction( idCnvM, desc39, DialogModes.NO ); 
13. } 
14.  
15. converToCMYK ( rasterize = true ) ; 

function converToCMYK( rasterize )
{
    var idCnvM = charIDToTypeID( "CnvM" );
    var desc39 = new ActionDescriptor();
    var idT = charIDToTypeID( "T  " );
    var idCMYM = charIDToTypeID( "CMYM" );
    desc39.putClass( idT, idCMYM );
    var idMrge = charIDToTypeID( "Mrge" );
    desc39.putBoolean( idMrge, false );
    var idRstr = charIDToTypeID( "Rstr" );
    desc39.putBoolean( idRstr, rasterize );
    executeAction( idCnvM, desc39, DialogModes.NO );
}

converToCMYK ( rasterize = true ) ;

This code is copied from ScriptingListenerJS.log which is the output of the ScriptListener.8li plugin.

So this is the correct answer when taken into account the 3 spaces after  the T in : var idT = charIDToTypeID( "T  " );

Thank you so much!!