improved input dir handling

PDFWorkflowManager/PDFWorkflowManager/ImageService.cs

@@ -0,0 +1,56 @@
+using ImageMagick;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+
+namespace PDFWorkflowManager
+{
+    public static class ImageService
+    {
+        public static void ConvertToJpeg(string sourceFileName, string destinationFileName, int compressionLevel, int dpi = 300)
+        {
+            using (Image sourceImage = Image.FromFile(sourceFileName))
+            {
+                float scaleFactor = dpi / sourceImage.HorizontalResolution;
+                int newWidth = (int)(sourceImage.Width * scaleFactor);
+                int newHeight = (int)(sourceImage.Height * scaleFactor);
+
+                using (var newImage = new Bitmap(newWidth, newHeight))
+                {
+                    newImage.SetResolution(dpi, dpi);
+                    using (Graphics graphics = Graphics.FromImage(newImage))
+                    {
+                        graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
+                        graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
+                        graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
+                        graphics.DrawImage(sourceImage, 0, 0, newWidth, newHeight);
+                    }
+                    EncoderParameters encoderParameters = new EncoderParameters(1);
+                    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, compressionLevel);
+                    ImageCodecInfo jpegCodec = GetEncoderInfo(ImageFormat.Jpeg);
+                    newImage.Save(destinationFileName, jpegCodec, encoderParameters);
+                }
+            }
+        }
+
+        public static ImageCodecInfo GetEncoderInfo(ImageFormat format)
+        {
+            foreach (ImageCodecInfo codec in ImageCodecInfo.GetImageDecoders())
+            {
+                if (codec.FormatID == format.Guid)
+                    return codec;
+            }
+            return null;
+        }
+
+        public static void CreateThumbnail(string fileName, string outputPath)
+        {
+            using (var image = new MagickImage(fileName))
+            {
+                var size = new MagickGeometry(240, 340) { IgnoreAspectRatio = false };
+                image.Resize(size);
+                image.Write(outputPath);
+            }
+        }
+    }
+}