diff --git a/App/Processor/ImageExtractor.cs b/App/Processor/ImageExtractor.cs
index 56a9720d..72761b09 100644
--- a/App/Processor/ImageExtractor.cs
+++ b/App/Processor/ImageExtractor.cs
@@ -164,21 +164,16 @@ internal void ExtractImage(ImageInfo info) {
 			var fileName = GetNewImageFileName();
 			if (info.ExtName == Constants.FileExtensions.Png
 				|| info.ExtName == Constants.FileExtensions.Tif
-				//|| info.MaskBytes != null
 				) {
 				SaveBitmap(info, bytes, fileName);
 			}
 			else {
 				SaveImageBytes(info, bytes, fileName);
 			}
-			if (info.MaskBytes != null) {
-				using (var m = new FreeImageBitmap(
-					info.MaskSize.Width, info.MaskSize.Height,
-					(info.MaskSize.Width + 7) / 8, PixelFormat.Format1bppIndexed,
-					info.MaskBytes)) {
-					//var r = bmp.Composite (false, null, m);
+			if (info.Mask != null) {
+				using (var m = info.Mask) {
 					m.Palette.CreateGrayscalePalette();
-					m.Save(fileName + "[mask]" + Constants.FileExtensions.Tif);
+					m.Save($"{fileName}[mask]{(info.Mask.PixelFormat == PixelFormat.Format1bppIndexed ? Constants.FileExtensions.Tif : Constants.FileExtensions.Png)}");
 				}
 			}
 			_totalImageCount++;
diff --git a/App/Processor/Imaging/ImageInfo.cs b/App/Processor/Imaging/ImageInfo.cs
index 721b3e41..dc99c406 100644
--- a/App/Processor/Imaging/ImageInfo.cs
+++ b/App/Processor/Imaging/ImageInfo.cs
@@ -26,8 +26,7 @@ internal sealed class ImageInfo
 		public PdfName PaletteColorSpace { get; private set; }
 		public byte[] PaletteBytes { get; private set; }
 		public byte[] ICCProfile { get; private set; }
-		public Size MaskSize { get; private set; }
-		public byte[] MaskBytes { get; private set; }
+		public FreeImageBitmap Mask { get; private set; }
 		public int PaletteEntryCount { get; private set; }
 		public RGBQUAD[] PaletteArray { get; private set; }
 		public PdfImageData InlineImage { get; private set; }
@@ -200,9 +199,8 @@ private static byte[] DecodeImage(ImageInfo info, ImageExtracterOptions options)
 				) {
 				var mi = new ImageInfo(sm);
 				var mask = DecodeImage(mi, new ImageExtracterOptions() { InvertBlackAndWhiteImages = !options.InvertSoftMask });
-				if (mask != null && mi.BitsPerComponent == 1) {
-					info.MaskBytes = mask;
-					info.MaskSize = new Size(mi.Width, mi.Height);
+				if (mask != null) {
+					info.Mask = ImageExtractor.CreateFreeImageBitmap(mi, ref mask, options.VerticalFlipImages, false);
 				}
 			}
 			return decodedBytes;