JS CS3 flag duplicate images with scale and rotation differnce

Question

I've been trying to cut down on the number of images a script I have would produce.  The old script would look for links that are being used multiple times and then just version the link which is fine.  What I am finding this that although a document may have one image linked 9 time 6 times out of the nine the image is scaled and rotated the same amount and the other 3 times the rotation and scaling also match. In this example the image only needs 2 versions the first as the original and the second with the scale and rotation of the image used 3 time let say.
So to the code:
The following code will work through the doc and create an array of the links as duplicates:
function LinkUsage(myLink) {
    var myLinkCounter = 0;
        for (var myCounter =  0; myCounter < myDoc.links.length; myCounter++) {
        if (myLink.filePath == myDoc.links[myCounter].filePath) {
            myLinkCounter++;
    return myLinkCounter
var myDoc = app.activeDocument;var myNumLinks = [];
for ( var t = myDoc.links.length-1; t >= 0; t-- ){
    if(LinkUsage(myDoc.links[t])>1){
            myNumLinks.push(myDoc.links[t].id);
Is there a way to loop through the array and only flag the differnent scale and roatations.  What I should get is that out of the multiple link uasage the image is only changed twice out of the 9 times used.
I was trying to loop through the array and then loop through it within the loop to compare the link but this does not work for obvious reasons.
for (var i=0  ; i <myNumLinks.length; i++){
    var valLink = myDoc.links.itemByID( myNumLinks[i]);
        if(valLink.parent.constructor.name == "Image"){
            for (var j=0  ; j<myNumLinks.length; j++){
                if(myDoc.links.itemByID( myNumLinks[j]).parent.constructor.name == "Image"){
                    if(valLink.parent.parent.images[0].rotationAngle != myDoc.links.itemByID( myNumLinks[j]).parent.parent.images[0].rotationAngle){
                        $.write(myNumLinks[i]+"\n");
Is what I am trying to do possible and if so any suggestions would be appreciated.
Cheers, John.

Answer 1

I think I might be one step closer to getting this to work.  I've been able to just capture the file path of the duplicates using:
//count the number of times the link is used
function LinkUsage(myLink) {
    var myLinkCounter = 0;
        for (var myCounter =  0; myCounter < myDoc.links.length; myCounter++) {
        if (myLink.filePath == myDoc.links[myCounter].filePath) {
            myLinkCounter++;
    return myLinkCounter
//check if the filepath has been added to the array
function chkVal(val){
    var compCount = 0;
    for(var arr =  0; arr < myNumLinks.length; arr++){
        if(val == myNumLinks[arr] ){
        compCount++;
    if(compCount >=1){
        return false;
        }else{
            return true;
//check the links inthe doc
var myDoc = app.activeDocument;
var myNumLinks = [];
for ( var t = myDoc.links.length-1; t >= 0; t-- ){
    if(LinkUsage(myDoc.links[t])>1){
        if(myNumLinks == 0){
            myNumLinks.push(myDoc.links[t].filePath);
            }else{
                if(chkVal(myDoc.links[t].filePath)){
                    myNumLinks.push(myDoc.links[t].filePath);
for (var i=0  ; i <myNumLinks.length; i++){
    $.write(myNumLinks[i]+"\n");