fixed padding tooltip for all

tools/OcrDaemon/ImagePreprocessor.cs

@@ -11,15 +11,25 @@ static class ImagePreprocessor
     /// Isolates bright tooltip text, suppresses dim background text visible through overlay.
     /// Pipeline: grayscale → morphological top-hat → Otsu binary → 2x upscale
     /// </summary>
-    public static Bitmap PreprocessForOcr(Bitmap src)
+    public static Bitmap PreprocessForOcr(Bitmap src, OcrOptions? options = null)
     {
+        if (options != null && !options.Preprocess)
+            return CloneArgb(src);
+
+        int kernelSize = options?.KernelSize ?? 25;
+        if (kernelSize < 3) kernelSize = 3;
+        if (kernelSize % 2 == 0) kernelSize += 1;
+
+        int scale = options?.Scale ?? 2;
+        if (scale < 1) scale = 1;
+
         using var mat = BitmapConverter.ToMat(src);
         using var gray = new Mat();
         Cv2.CvtColor(mat, gray, ColorConversionCodes.BGRA2GRAY);
 
         // Morphological white top-hat: isolates bright text on dark background
         // Kernel size 25x25 captures text strokes, suppresses dim background text
-        using var kernel = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(25, 25));
+        using var kernel = Cv2.GetStructuringElement(MorphShapes.Rect, new OpenCvSharp.Size(kernelSize, kernelSize));
         using var tophat = new Mat();
         Cv2.MorphologyEx(gray, tophat, MorphTypes.TopHat, kernel);
 
@@ -28,10 +38,19 @@ static class ImagePreprocessor
         Cv2.Threshold(tophat, binary, 0, 255, ThresholdTypes.BinaryInv | ThresholdTypes.Otsu);
 
         // 2x upscale for better LSTM recognition
+        if (scale == 1)
+            return BitmapConverter.ToBitmap(binary);
+
         using var upscaled = new Mat();
-        Cv2.Resize(binary, upscaled, new OpenCvSharp.Size(binary.Width * 2, binary.Height * 2),
+        Cv2.Resize(binary, upscaled, new OpenCvSharp.Size(binary.Width * scale, binary.Height * scale),
             interpolation: InterpolationFlags.Cubic);
 
         return BitmapConverter.ToBitmap(upscaled);
     }
+
+    private static Bitmap CloneArgb(Bitmap src)
+    {
+        var rect = new Rectangle(0, 0, src.Width, src.Height);
+        return src.Clone(rect, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+    }
 }