Batch replace a colour with another colour

Question

I have over 100 documents. In these documents, some of the objects use a regular black colour (e.g. C0, M0, Y0, K100). I need to replace it as a rich black (e.g. C75, M68, Y67, K90). The regular black colour is NOT saved as a swatch, so I can't just update the swatch. The objects are made of paths and shapes, some of which are in groups.
I found a script here and have updated it to suit my needs (The original script requires you to select an object, my update automatically selects all objects in the file). It works fine on a simple document that has a few layers. However, on more complex documents that have multiple nested layers, I get the following error:
Error 1302: No such element
Line: 9
->       myItem=docRef.pathItems[i];
Here is my code:
var docRef = app.activeDocument;
docRef.hasSelectedArtwork = true;
var iL=docRef.pageItems.length;
for (i=0;i<iL;i++){
     myItem=docRef.pathItems[i];
          if (myItem.fillColor=="[CMYKColor]" && myItem.selected){ //implement only for CMYK and selected
     var c1=0;
     var m1=0;
     var y1=0;
     var k1=100;
     var c2=Math.round(myItem.fillColor.cyan); // round the number ( 0,0012 => 0 )
     var m2=Math.round(myItem.fillColor.magenta); // round the number ( 6,8898 => 7 )
     var y2=Math.round(myItem.fillColor.yellow);
     var k2=Math.round(myItem.fillColor.black);
     if (c1==c2&&m1==m2&&y1==y2&&k1==k2){ // compare
     myItem.fillColor.cyan=75;
     myItem.fillColor.magenta=68;
     myItem.fillColor.yellow=67;
     myItem.fillColor.black=90;
      redraw();
                    } // if compare
          } // if CMYK
     } // end for
How can I overcome the error.

Answer 1

Hi @big_smile,
It's ok.
But you are right, I was a little bit frustrated. Because of: no feedback is the "worst" feedback.
And like I said before, your question isn't easy to answer. To check the difficult you can start with this little snippet:
var aDoc = app.activeDocument;
//var pI = aDoc.pageItems;
//var pILen=pI.length;
// please select some items before running this script snippet
var pI = aDoc.selection;
var pILen=pI.length;
var item;
for (i=0;i<=pILen-1;i++) {
    item = pI[i];
    $.writeln("item "+i+":  "+item.typename);
    $.writeln("clipped =  "+item.clipped);
    if (item.typename == "PathItem") {
        // if GroupItem --> loop through the groupItems.pathItems
        // if CompoundPathItem --> loop through the CompoundPathItems.pathItems
        $.writeln(item.fillColor)
        $.writeln(item.strokeColor)
        $.writeln(item.filled)
        $.writeln(item.fillColor.color)
        if (item.filled == true && item.fillColor.typename == "CMYKColor" ) {
            alert("item "+i+"  fillColor:  "+item.fillColor.typename);
        if (item.stroked == true && item.strokeColor.typename == "CMYKColor" ) {
            alert("item "+i+"  strokeColor:  "+item.strokeColor.typename);
Please select some items before running this script snippet (otherwise it may takes a long time).
And please, check your JavaScript console in ESTK after running this script.
I know, this can't be a correct answer, but perhaps this is a little bit helpful for the beginning.