iOSで@3xの画像から@1xと@2xの画像にリサイズするPhotoshopスクリプト

Resize iOS Image Directory.jsx

// フォルダを指定して一括リサイズ
function resizeImage(file, destFolder) {

  try {

    var doc = open(file, OpenDocumentType.PNG)

    if (doc == null) {
      throw "Something is wrong with the file.  Make sure it's a valid PNG file.";
    }

    var startState = doc.activeHistoryState;
    var initialPrefs = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS

    var sfw = new ExportOptionsSaveForWeb();
    sfw.format = SaveDocumentType.PNG;
    sfw.PNG8 = false; // use PNG-24
    sfw.transparency = true;
    doc.info = null;  // delete metadata

    var baseWidth = Math.floor(doc.width / 3.0);
    var baseHeight = Math.floor(doc.height / 3.0);
    var filename = doc.name;
    filename = filename.replace(".png", "");
    filename = filename.replace("@3x", "");

    var images = [
      {"ext": "", "width": baseWidth, "height": baseHeight},
      {"ext": "@2x", "width": baseWidth * 2, "height": baseHeight * 2},
      {"ext": "@3x", "width": baseWidth * 3, "height": baseHeight * 3}
    ];

    for (var i = 0; i < images.length; i++) {
      var image = images[i];
      doc.resizeImage(image.width, image.height, null, ResampleMethod.BICUBICSHARPER);

      var outPath = destFolder + "/" + filename + image.ext + ".png";

      doc.exportDocument(new File(outPath), ExportType.SAVEFORWEB, sfw);
      doc.activeHistoryState = startState
    }

    return true;

  } catch (exception) {

    if ((exception != null) && (exception != "")) {
      alert(exception);
    }
    return false;

  } finally {
    if (doc != null) {
      doc.close(SaveOptions.DONOTSAVECHANGES);
    }
    app.preferences.rulerUnits = initialPrefs; // restore prefs
  }
}

var inFolder = Folder.selectDialog("Choose a input folder");
var destFolder = Folder.selectDialog("Choose an output folder");

var fileList = inFolder.getFiles("*.png");

var result = true;

for (var i = 0; i < fileList.length; i++) {
  if (!resizeImage(fileList[i], destFolder)) {
    result = false;
    break;
  }
}

if (result) {
  alert("Resized!");
}

Resize iOS Image.jsx

// ファイルを１つずつ選択
try {

  var at3ximage = File.openDialog("Select @3x file", "*.png", false);

  if (at3ximage == null) {
    throw "";
  }

  var doc = open(at3ximage, OpenDocumentType.PNG)

  if (doc == null) {
    throw "Something is wrong with the file.  Make sure it's a valid PNG file.";
  }

  var startState = doc.activeHistoryState;
  var initialPrefs = app.preferences.rulerUnits;
  app.preferences.rulerUnits = Units.PIXELS

  var destFolder = Folder.selectDialog("Choose an output folder");

  if (destFolder == null) {
    throw "";
  }

  var sfw = new ExportOptionsSaveForWeb();
  sfw.format = SaveDocumentType.PNG;
  sfw.PNG8 = false; // use PNG-24
  sfw.transparency = true;
  doc.info = null;  // delete metadata

  var baseWidth = Math.floor(doc.width / 3.0);
  var baseHeight = Math.floor(doc.height / 3.0);
  var filename = doc.name;
  filename = filename.replace(".png", "");
  filename = filename.replace("@3x", "");

  var images = [
    {"ext": "", "width": baseWidth, "height": baseHeight},
    {"ext": "@2x", "width": baseWidth * 2, "height": baseHeight * 2},
    {"ext": "@3x", "width": baseWidth * 3, "height": baseHeight * 3}
  ];

  for (var i = 0; i < images.length; i++) {
    var image = images[i];
    doc.resizeImage(image.width, image.height, null, ResampleMethod.BICUBICSHARPER);

    var outPath = destFolder + "/" + filename + image.ext + ".png";

    doc.exportDocument(new File(outPath), ExportType.SAVEFORWEB, sfw);
    doc.activeHistoryState = startState
  }

  alert("Resized!")

} catch (exception) {
  if ((exception != null) && (exception != "")) {
    alert(exception);
  }
} finally {
  if (doc != null) {
    doc.close(SaveOptions.DONOTSAVECHANGES);
  }
  app.preferences.rulerUnits = initialPrefs; // restore prefs
}