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Here is an example of a self-contained script that will save JPEG files with the file name in the lower right from selected input files. A sub-directory will be created titled "Filename Added" to ensure that the original files with the same name are not overwritten.

[CODE=javascript]#target photoshop

// Save the original dialog display

var originalDialogMode = app.displayDialogs;

app.displayDialogs = DialogModes.NO;

// Save the original ruler units

var originalRulerUnits = app.preferences.rulerUnits;

// Set the working units to px

app.preferences.rulerUnits = Units.PIXELS;

var selectFiles = File.openDialog("Select the input files:", Multiselect = true);

var outputFolder = Folder.selectDialog("Select the save folder:");

outputFolder = new Folder(decodeURI(outputFolder) + '/Filename Added');

if (outputFolder.exists == false) outputFolder.create();

// Set the file processing counter to zero

var counter = 0;

for (var i = 0; i < selectFiles.length; i++) {

    open(selectFiles[i]);

    // Create the text layer

    app.activeDocument.artLayers.add();

    app.activeDocument.activeLayer.kind = LayerKind.TEXT;

    // Optionally set the layer to difference blend mode

    //app.activeDocument.activeLayer.blendMode = BlendMode.DIFFERENCE;

    // Set the text content to the document name without filename extension

    var theText = app.activeDocument.activeLayer.textItem;

    theText.contents = app.activeDocument.name.replace(/\.[^\.]+$/, '');

    // Set the text variables

    theText.position = [85, 140];

    var theColour = new SolidColor();

    theColour.rgb.red = 255;

    theColour.rgb.green = 255;

    theColour.rgb.blue = 255;

    theText.color = theColour;

    //theText.font = 'Times-Italic';

    theText.font = 'ArialMT';

    //theText.size = 20;

    // Set text height to 5% of the doc height

    var textSize = app.activeDocument.height / 100 * 5 * 72 / app.activeDocument.resolution;

    theText.size = textSize;

    // Move the text to the lower right, offset by the text height x2

    app.activeDocument.selection.selectAll();

    alignToSel('AdRg');

    alignToSel('AdBt');

    app.activeDocument.activeLayer.translate(-textSize.value * 2, -textSize.value * 2);

    app.activeDocument.selection.deselect();

    // Save

    var saveJPEGName = File(outputFolder + "/" + theText.contents + ".jpg");

    saveJPEG(saveJPEGName);

    app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

    // Increment the file processing counter

    counter++;

}

// Reset the original application settings

app.preferences.rulerUnits = originalRulerUnits;

app.displayDialogs = originalDialogMode;

// End of script notification

alert("Script completed!" + "\r" + "Files selected: " + selectFiles.length + "\r" + "Files processed: " + counter);

// Functions

function alignToSel(method) {

    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) {}

}

function saveJPEG(saveFile) {

    var jpgOptns = new JPEGSaveOptions();

    jpgOptns.formatOptions = FormatOptions.STANDARDBASELINE;

    jpgOptns.embedColorProfile = true;

    jpgOptns.quality = 10; // 0 - 12

    activeDocument.saveAs(saveFile, jpgOptns, true, Extension.LOWERCASE);

}[/CODE]