It seems to be working by me. Be aware, I think it’s an Illustrator script, not InDesign. Try it in AI.

I modified the script a bit, so it should work individually even when multiple graphics are selected.

//Ari S. - designerjoe@outlook.com
app.scriptPreferences.enableRedraw = false;
// 'Undo' will undo the entire script
app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, "Image Manipulation Script");

function main(){
    // Capture the current selections in array
    var mySelections = app.selection;
    for (var i = 0; i < mySelections.length; i++) {
        try{
            var bottomObject = mySelections[i];
            var topObject = bottomObject.duplicate();
            bottomObject.transparencySettings.blendingSettings.blendMode = BlendMode.MULTIPLY;
            try {
                topObject.pageItems.item(0).clippingPath.appliedPathName = topObject.pageItems.item(0).clippingPath.photoshopPathNames[0];
                topObject.pageItems.item(0).clippingPath.clippingType = ClippingPathType.PHOTOSHOP_PATH;
                try {
                    var myGroup = bottomObject.parent.groups.add ([bottomObject, topObject]);
                    app.select(myGroup);
                    }
                catch (myError) {
                    // If it can't group
                    alert("could not group successfully");
                    }
                }
            catch (myError) {
                // If it can't apply the Photoshop path then it obviously does not have one
                alert("Selected image does not have a Photoshop path applied")
                }
            }
        catch (myError){
            // If it can't duplicate the object or apply multiply then it's obviously not a graphic frame
            alert("Make sure you selected a graphic frame");
            }
        }
    }

Will probably have it ready for today.

I can try writing a script if it’s possible, but I’m unfamiliar with the Cross-References workflow in InDesign as I never used it. So if you don’t mind to upload to Drive or DropBox a page or two so that I can look into it.

If you insist on converting the imaes to grayscale in Photoshop you can take this approach:

Place all original color images in a folder (and name it something like ‘color images’).

Whenever you convert an image to grayscale in Photoshop, save it to a separate folder (called ‘b&w images’). But here’s the catch: Leave the file name of the image intact! So for example, if the original image’s file name is ‘background2.jpg’ then the converted grayscale image should have the exact same file name (‘background2.jpg), but saved in the ‘b&w images’ folder.

And here’s the cool part. When you place the images into the document, select it from the ‘color’ folder, So all the images in the document will be color. Then you can export it to epub. When when you’re ready to export to pdf do the following: In the Links panel select all the image links that you want to change to grayscale, in the panel flyout menu select ‘Relink to Folder’, and browse and select the ‘b&w images’. In a second all the images will change to the grayscale version. To switch back to the color version you do the same but now you choose the ‘color images’ folder.

The following GREP expression is much more robust as it finds the first instance of a tab in a sentence regardless of how many tabs follow it. Because Skemicle’s expression (as he noted himself) only works if you have exactly two tabs in the paragraph. if there’s only one, or more than two it doesn’t work they way it should. Plus, if you have two tabs consecutively (highly unlikely, but still…) it won’t find either of them. But the following expression has none of those issues:

Find What: (?!=*$)
Change To:

G’luck!

Here you go, I’ve written this script for you. With the document that you want to package individually open, run this script. If it’s a large file it might take a few minutes because it basically makes a new document from every page, packages it, and deletes the temporary document. When done you’ll find a folder on your desktop with the name of your file, in it every page will have its own subfolder, with its files, images and fonts.

If you don’t know how to save and run this script, look here: https://creativepro.com/how-to-install-a-script-in-indesign-that-you-found-in-a-forum-or-blog-post.php

Following is the script:

//created by Ari S. --  designerjoe@outlook.com
// Package every page individually

app.scriptPreferences.enableRedraw = false;
var myDoc = app.activeDocument;
var sourceTitle = myDoc.name;
var myPages = myDoc.pages;
for (i=0; i <myPages.length; i++){
    var currentSourcePage = myPages[i];
    if (currentSourcePage.pageItems.length==0) continue;
    var pageName = currentSourcePage.name;
    var sourceWidth = myDoc.documentPreferences.pageWidth;
    var sourceHeight = myDoc.documentPreferences.pageHeight;
    var sourceMaster = currentSourcePage.appliedMaster;
    var myNewDoc = app.documents.add();
    myNewDoc.documentPreferences.pageWidth = sourceWidth;
    myNewDoc.documentPreferences.pageHeight = sourceHeight;
    var myNewPage = myNewDoc.pages[0];
    currentSourcePage.duplicate(undefined, myNewPage);
    var newMaster = sourceMaster.duplicate(undefined, myNewDoc);
    var myNewPagesArray = myNewDoc.pages;
    for (j=myNewPagesArray.length - 1; j >=0; j--){
        if (myNewPagesArray[j].pageItems.length==0){
        myNewPagesArray[j].remove();
        }
    }
        myNewDoc.pages[0].appliedMaster = newMaster;
    if (currentSourcePage.side == PageSideOptions.leftHand){
        myNewDoc.documentPreferences.startPageNumber = 2;
        }
    createPackage(myNewDoc);
    }

function createPackage(myNewDoc) {
    var targetFolder = new File("~/Desktop/" + sourceTitle +"/Page " + pageName + "/");
    var flag = Folder(targetFolder).create();
    
    // ------- HERE YOU CAN CHANGE ANY PACKAGING SETTING THAT YOU WANT. TRUE means 'ON', and FALSE means 'OFF': ---------
    var copyingFonts = true;
    var copyingLinkedGraphics = true;
    var copyingProfiles = true;
    var updatingGraphics = true;
    var includingHiddenLayers = true;
    var ignorePreflightErrors = true;
    var creatingReport = true;
    var includeIDML = true;
    var includePDF = false;
    var pdfStyle = "";
    var forceSave = true;
    var versionComments = sourceTitle + " " + "page " + pageName ;

    
    if ( flag === true){
        myName = "Page " + pageName;
        var garbageFolder = new File("~/Desktop/" + sourceTitle +"/Delete This Folder/");
        Folder(garbageFolder).create();
        myNewDoc.save(new File("~/Desktop/" + sourceTitle + "/Delete This Folder/" + myName + ".indd"))
        myNewDoc.packageForPrint (
        targetFolder, 
        copyingFonts, 
        copyingLinkedGraphics, 
        copyingProfiles, 
        updatingGraphics, 
        includingHiddenLayers,
        ignorePreflightErrors,
        creatingReport,
        includeIDML,
        includePDF,
        pdfStyle,
        versionComments,
        forceSave       
        );
        myNewDoc.close(SaveOptions.no);
        var myTempFiles = Folder(garbageFolder).getFiles();
        for (k=myTempFiles.length-1; k >=0; k--)
        myTempFiles[k].remove();
        Folder(garbageFolder).remove();
        }
    }

Please let me know if it works.

P.S. If you want to change any packaging settings (for ex. if you want to export an .idml as well) go to the lines below the line that says “Here you can change any packaging settings…”, and turn on or off any setting by setting it to true (on) or false (off) respectively.

My pleasure! I find it’s best to use the ESTK when writing JS for Adobe apps.