Scale images to multiple sizes in Photoshop using JSX scripted batch processing automation

photo-resize.jsx

#target "photoshop"

if (BridgeTalk.appName == "photoshop") {
    app.bringToFront();

    var inputFolder = Folder.selectDialog("Select the folder containing photos to be resized."),
        imageSizes = [2048, 1024, 512, 256];

    if (inputFolder != null) {
        var fileList = inputFolder.getFiles(/\.(jpg|jpeg|tif|psd|)$/i);

        for (var n = 0; n < imageSizes.length; n++) {
            var outputFolder = new Folder(decodeURI(inputFolder) + "/export-" + imageSizes[n]);

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

            for (var i = 0; i < fileList.length; i++) {
                if (fileList [i] instanceof File) {
                    var document = open(fileList [i]);
                    var documentName = fileList [i].name.slice(0, -4);

                    while (app.documents.length) {
                        var newFile = new File(decodeURI(outputFolder) + "/" + documentName + ".jpg");

                        document.flatten();

                        if (document.width > document.height) {
                            document.resizeImage(null, UnitValue(imageSizes[n], "px"), null, ResampleMethod.BICUBICSHARPER);
                        } else {
                            document.resizeImage(UnitValue(imageSizes[n], "px"), null, null, ResampleMethod.BICUBICSHARPER);
                        }

                        var exportOptions = new JPEGSaveOptions();
                        exportOptions.embedColorProfile = true;
                        exportOptions.quality = 8;
                        document.saveAs(newFile, exportOptions, true, Extension.LOWERCASE);

                        document.close(SaveOptions.DONOTSAVECHANGES);
                    }
                }
            }
        }
    }
}