Photoshop batch script - Snippet

Javascript
4 wk. ago
Batch resize images to a specific canvas size, centers them and exports them as a png or jpg.
batch
images
photoshop
#target photoshop
// update these vars below: targetW, targetH
// toggle comment Save as PNG or JPG

(function () {
    // Prompt user to select input folder
    var inputFolder = Folder.selectDialog("Select the folder with images to process:");
    if (!inputFolder) {
        alert("No folder selected. Exiting.");
        return;
    }

    // Prompt user to select output folder
    var outputFolder = Folder.selectDialog("Select the folder to save processed images:");
    if (!outputFolder) {
        alert("No output folder selected. Exiting.");
        return;
    }

    var files = inputFolder.getFiles(/\.(jpg|jpeg|png|tif|tiff|bmp)$/i);
    if (files.length === 0) {
        alert("No image files found in selected folder.");
        return;
    }

    // Set target canvas dimensions
    var targetW = 1500;
    var targetH = 1000;

    for (var i = 0; i < files.length; i++) {
        var file = files[i];
        if (!(file instanceof File)) continue;

        var doc = open(file);
        app.activeDocument = doc;
        doc.changeMode(ChangeMode.RGB);

        // Resize proportionally to fit inside target dimensions
        var w = doc.width.as("px");
        var h = doc.height.as("px");
        var scale = Math.min(targetW / w, targetH / h);
        doc.resizeImage(UnitValue(w * scale, "px"), UnitValue(h * scale, "px"), null, ResampleMethod.BICUBIC);

        // Create transparent canvas
        var tempDoc = app.documents.add(
            targetW, targetH, doc.resolution, "TempCanvas", NewDocumentMode.RGB, DocumentFill.TRANSPARENT
        );

        // Copy/paste from resized image
        app.activeDocument = doc;
        doc.selection.selectAll();
        doc.selection.copy();
        doc.close(SaveOptions.DONOTSAVECHANGES);

        app.activeDocument = tempDoc;
        tempDoc.paste();
        var layer = tempDoc.activeLayer;

        // Center the pasted layer
        var dx = (targetW - (layer.bounds[2].as("px") - layer.bounds[0].as("px"))) / 2 - layer.bounds[0].as("px");
        var dy = (targetH - (layer.bounds[3].as("px") - layer.bounds[1].as("px"))) / 2 - layer.bounds[1].as("px");
        layer.translate(dx, dy);

        // Save as PNG
        var saveFile = new File(outputFolder + "/" + decodeURI(file.name).replace(/\.[^\.]+$/, "") + ".png");
        var pngOptions = new PNGSaveOptions();
        pngOptions.compression = 9;
        pngOptions.interlaced = false;
        tempDoc.saveAs(saveFile, pngOptions, true, Extension.LOWERCASE);

        // Save as JPG
        // var saveFile = new File(outputFolder + "/" + decodeURI(file.name).replace(/\.[^\.]+$/, "") + ".jpg");
        // var jpgOptions = new JPEGSaveOptions();
        // jpgOptions.quality = 12;
        // jpgOptions.formatOptions = FormatOptions.STANDARDBASELINE;
        // jpgOptions.embedColorProfile = true;
        // jpgOptions.matte = MatteType.NONE;
        // tempDoc.saveAs(saveFile, jpgOptions, true, Extension.LOWERCASE);

        tempDoc.close(SaveOptions.DONOTSAVECHANGES);
    }

    alert("Done! Saved " + files.length + " images as " + targetW + "x" + targetH + " to:\n" + outputFolder.fsName);
})();