Creating duplicate images for multi-packs on Online Marketplaces within Photoshop

@26290676, your script works as intended, then it is just a matter to scale to the desired size.

Could the OP lauch your script via an action, set the number of copies, and then scale to size.

It always surprises me how demanding some can be with someone else's time, and they intend to make money out of it!!!

@defaultc46l0h0jo9o1  An action can do it as well: jump to new layer, set to percentage, canvas size, alt-drag a copy, repeat as desired, scale down as wanted. You'll learn a lot while experimenting!

Again from Trevor Morris: https://morris-photographics.com/photoshop/tutorials/actions.html

First response after almost 2 months is like shouting to emptiness.

It appears that the script from Trevor Morris linked above does not work correctly with current versions of Photoshop.

Rather than debugging the code, I decided to create my own:

/*
Step & Repeat N Times.jsx
v1.0 - Stephen Marsh, 2nd January 2022

https://community.adobe.com/t5/photoshop-ecosystem-discussions/creating-duplicate-images-for-multi-packs-on-online-marketplaces-within-photoshop/td-p/12511723
*/

#target photoshop

/* ScriptUI Dialog */
// Dialog
var dialog = new Window("dialog");
dialog.text = "Step & Repeat N Times";
dialog.preferredSize.width = 280;
dialog.preferredSize.height = 135;
dialog.orientation = "row";
dialog.alignChildren = ["center", "top"];
dialog.spacing = 10;
dialog.margins = 10;

// Copies group
var copiesGroup = dialog.add("group", undefined, {
    name: "copiesGroup"
});
copiesGroup.orientation = "column";
copiesGroup.alignChildren = ["left", "top"];
copiesGroup.spacing = 5;
copiesGroup.margins = 0;

var labelCopiesX = copiesGroup.add("statictext", undefined, undefined, {
    name: "labelCopiesX"
});
labelCopiesX.text = "X Copies:";

// Note: use editnumber instead of edittext for numerical fields!

var copiesX = copiesGroup.add('editnumber {properties: {name: "copiesX"}}');
copiesX.text = "1";
copiesX.preferredSize.width = 50;
copiesX.alignment = ["fill", "top"];
// Preset the first field to be selected/active
copiesX.active = true;

var labelCopiesY = copiesGroup.add("statictext", undefined, undefined, {
    name: "labelCopiesY"
});
labelCopiesY.text = "Y Copies:";

var copiesY = copiesGroup.add('editnumber {properties: {name: "copiesY"}}');
copiesY.text = "1";
copiesY.preferredSize.width = 50;
copiesY.alignment = ["fill", "top"];

// Info footer text
/*
var infoGroup = copiesGroup.add("group", undefined, {name: "infoGroup"}); 
    infoGroup.orientation = "column"; 
    infoGroup.alignChildren = ["left","top"]; 
    infoGroup.spacing = 10; 
    infoGroup.margins = [0,10,0,0]; 
    infoGroup.alignment = ["left","top"]; 
    var infoText = infoGroup.add("statictext", undefined, undefined, {name: "infoText"}); 
    infoText.text = "v1.0 - Stephen Marsh, 2nd January 2022";
*/

// Gap group
var gapGroup = dialog.add("group", undefined, {
    name: "gapGroup"
});
gapGroup.orientation = "column";
gapGroup.alignChildren = ["left", "top"];
gapGroup.spacing = 5;
gapGroup.margins = 0;

var labelGapX = gapGroup.add("statictext", undefined, undefined, {
    name: "labelGapX"
});
labelGapX.text = "X Gap (px):";

var gapX = gapGroup.add('editnumber {properties: {name: "gapX"}}');
gapX.text = "0";
gapX.preferredSize.width = 50;
gapX.alignment = ["fill", "top"];

var labelGapY = gapGroup.add("statictext", undefined, undefined, {
    name: "labelGapY"
});
labelGapY.text = "Y Gap (px):";

var gapY = gapGroup.add('editnumber {properties: {name: "gapY"}}');
gapY.text = "0";
gapY.preferredSize.width = 50;
gapY.alignment = ["fill", "top"];

// Border group
var borderGroup = dialog.add("group", undefined, {
    name: "borderGroup"
});
borderGroup.orientation = "column";
borderGroup.alignChildren = ["left", "top"];
borderGroup.spacing = 5;
borderGroup.margins = 0;

var labelBorder = borderGroup.add("statictext", undefined, undefined, {
    name: "labelBorder"
});
labelBorder.text = "Border (px):";

var border = borderGroup.add('editnumber {properties: {name: "border"}}');
border.text = "0";
border.preferredSize.width = 50;
border.alignment = ["fill", "top"];

var okButton = borderGroup.add("button", undefined, undefined, {
    name: "okButton"
});
okButton.text = "OK";
okButton.alignment = ["fill", "top"];

var cancelButton = borderGroup.add("button", undefined, undefined, {
    name: "cancelButton"
});
cancelButton.text = "Cancel";
cancelButton.alignment = ["fill", "top"];

// Remember, digits entered into fields are strings, not numbers!


/* Main script */
function main() {
    // Ensure that the active layer is not a Background, is only a single layer and that the content is not empty
    if (!app.activeDocument.activeLayer.isBackgroundLayer && app.activeDocument.layers.length === 1) {
        // Render the GUI and OK button logic
        if (dialog.show() === 1) {
            // Call the function
            arrayGenerator();
            // End of script notification
            app.beep();
        }
    } else {
        alert("This script is designed to work only on a non-Background, single layer document!");
    }
}
app.activeDocument.suspendHistory("Step & Repeat N Times", "main()");

/* Main script function */
function arrayGenerator() {

    var doc = app.activeDocument;

    // Convert GUI variable strings to numbers...
    // var copiesX2 = Math.floor(copiesX.text);
    // The “double tilde” (~~) operator is a double NOT Bitwise operator. Use it as a substitute for Math.floor(), since it’s faster.
    var copiesX2 = ~~copiesX.text;
    var copiesY2 = ~~copiesY.text;
    var gapX2 = ~~gapX.text;
    var gapY2 = ~~gapY.text;
    var border2 = ~~border.text;
    /*
    alert(copiesX2.toSource())
    alert(copiesY2.toSource())
    alert(gapX2.toSource())
    alert(gapY2.toSource())
    alert(border2.toSource())
    */

    // Convert to % for relative canvas resize
    var newCanvasX = copiesX2 * 100;
    var newCanvasY = copiesY2 * 100;

    var savedRuler = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;

    // Relative % canvas resize
    relativeCanvasSizePercent(true, newCanvasX, newCanvasY);
    // Absolute px canvas resize
    doc.resizeCanvas(doc.width + gapX2 * copiesX2, doc.height + gapY2 * copiesY2, AnchorPosition.TOPLEFT);

    // Dupe X loop
    for (var i = 0; i < copiesX2; i++) {
        doc.activeLayer.duplicate();
    }
    // Align X to right
    align2SelectAll('AdRg');
    app.runMenuItem(stringIDToTypeID('selectAllLayers'));
    if (copiesX2 > 1) {
        // Distribute X: for 3 or more layers
        var iddistort = stringIDToTypeID("distort");
        var desc788 = new ActionDescriptor();
        var idnull = stringIDToTypeID("null");
        var ref298 = new ActionReference();
        var idlayer = stringIDToTypeID("layer");
        var idordinal = stringIDToTypeID("ordinal");
        var idtargetEnum = stringIDToTypeID("targetEnum");
        ref298.putEnumerated(idlayer, idordinal, idtargetEnum);
        desc788.putReference(idnull, ref298);
        var idusing = stringIDToTypeID("using");
        var idalignDistributeSelector = stringIDToTypeID("alignDistributeSelector");
        var idADSDistH = stringIDToTypeID("ADSDistH");
        desc788.putEnumerated(idusing, idalignDistributeSelector, idADSDistH);
        executeAction(iddistort, desc788, DialogModes.NO);
    }

    // Merge visible layers
    if (doc.layers.length > 1) {
        var idmergeVisible = stringIDToTypeID("mergeVisible");
        executeAction(idmergeVisible, undefined, DialogModes.NO);
    }

    // Rename layer
    doc.activeLayer.name = "Step & Repeat";

    // Dupe Y loop
    for (var i = 0; i < copiesY2; i++) {
        doc.activeLayer.duplicate();
    }
    // Align Y to bottom
    align2SelectAll('AdBt');
    app.runMenuItem(stringIDToTypeID('selectAllLayers'));
    if (copiesY2 > 1) {
        // Distribute Y: for 3 or more layers
        var iddistort = stringIDToTypeID("distort");
        var desc2102 = new ActionDescriptor();
        var idnull = stringIDToTypeID("null");
        var ref945 = new ActionReference();
        var idlayer = stringIDToTypeID("layer");
        var idordinal = stringIDToTypeID("ordinal");
        var idtargetEnum = stringIDToTypeID("targetEnum");
        ref945.putEnumerated(idlayer, idordinal, idtargetEnum);
        desc2102.putReference(idnull, ref945);
        var idusing = stringIDToTypeID("using");
        var idalignDistributeSelector = stringIDToTypeID("alignDistributeSelector");
        var idADSDistV = stringIDToTypeID("ADSDistV");
        desc2102.putEnumerated(idusing, idalignDistributeSelector, idADSDistV);
        executeAction(iddistort, desc2102, DialogModes.NO);
    }

    // Merge visible layers
    if (doc.layers.length > 1) {
        var idmergeVisible = stringIDToTypeID("mergeVisible");
        executeAction(idmergeVisible, undefined, DialogModes.NO);
    }

    // Rename layer
    doc.activeLayer.name = "Step & Repeat";

    // Optional outer margin absolute px canvas resize
    doc.resizeCanvas(doc.width + border2 * 2, doc.height + border2 * 2, AnchorPosition.MIDDLECENTER);

    app.preferences.rulerUnits = savedRuler;
}

/* Helper functions for main script */
function relativeCanvasSizePercent(relative, width, height) {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    descriptor.putBoolean(s2t("relative"), relative);
    descriptor.putUnitDouble(s2t("width"), s2t("percentUnit"), width);
    descriptor.putUnitDouble(s2t("height"), s2t("percentUnit"), height);
    descriptor.putEnumerated(s2t("horizontal"), s2t("horizontalLocation"), s2t("left"));
    descriptor.putEnumerated(s2t("vertical"), s2t("verticalLocation"), s2t("top"));
    executeAction(s2t("canvasSize"), descriptor, DialogModes.NO);
}

function align2SelectAll(method) {
    /* 
    AdLf = Align Left
    AdRg = Align Right
    AdCH = Align Centre Horizontal
    AdTp = Align Top
    AdBt = Align Bottom
    AdCV = Align Centre Vertical
    */
    app.activeDocument.selection.selectAll();
    var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putEnumerated(charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));
    desc.putReference(charIDToTypeID("null"), ref);
    desc.putEnumerated(charIDToTypeID("Usng"), charIDToTypeID("ADSt"), charIDToTypeID(method));
    try {
        executeAction(charIDToTypeID("Algn"), desc, DialogModes.NO);
    } catch (e) {}
    app.activeDocument.selection.deselect();
}

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html