C# ImageFormat类代码示例

    public static void TakeScreenShot(IWebDriver webDriver, string screenShotFileNameWithoutExtension, ImageFormat imageFormat, string screenShotDirectoryPath) {
        Screenshot screenShot = null;
        var browserName = string.Empty;

        if (webDriver.GetType() == typeof(InternetExplorerDriver)) {
            screenShot = ((InternetExplorerDriver)webDriver).GetScreenshot();
            browserName = "IE";
        }

        if (webDriver.GetType() == typeof(FirefoxDriver)) {
            screenShot = ((FirefoxDriver)webDriver).GetScreenshot();
            browserName = "Firefox";
        }

        if (webDriver.GetType() == typeof(ChromeDriver)) {
            screenShot = ((ChromeDriver)webDriver).GetScreenshot();
            browserName = "Chrome";
        }

        var screenShotFileName = screenShotFileNameWithoutExtension + "." + imageFormat.ToString().ToLower();

        if (screenShot != null) {
            if (!string.IsNullOrEmpty(screenShotDirectoryPath)) {
                Directory.CreateDirectory(screenShotDirectoryPath).CreateSubdirectory(browserName);
                var browserScreenShotDirectoryPath = Path.Combine(screenShotDirectoryPath, browserName);
                Directory.CreateDirectory(browserScreenShotDirectoryPath);
                var screenShotFileFullPath = Path.Combine(browserScreenShotDirectoryPath, screenShotFileName);
                screenShot.SaveAsFile(screenShotFileFullPath, imageFormat);
            }
        }
    }

 public JFIFThumbnail(byte[] palette, byte[] data)
     : this()
 {
     Format = ImageFormat.BMPPalette;
     Palette = palette;
     PixelData = data;
 }

        public MemoryStream GenerateImage(Visual vsual, int widhth, int height, ImageFormat format)
        {
            BitmapEncoder encoder = null;

            switch (format)
            {
                case ImageFormat.JPG :
                    encoder = new JpegBitmapEncoder();
                    break;
                case ImageFormat.PNG:
                    encoder = new PngBitmapEncoder();
                    break;
                case ImageFormat.BMP:
                    encoder = new BmpBitmapEncoder();
                    break;
                case ImageFormat.GIF:
                    encoder = new GifBitmapEncoder();
                    break;
                case ImageFormat.TIF:
                    encoder = new TiffBitmapEncoder();
                    break;

            }

            if (encoder == null) return null;

            RenderTargetBitmap rtb = this.RenderVisaulToBitmap(vsual, widhth, height);
            MemoryStream file = new MemoryStream();
            encoder.Frames.Add(BitmapFrame.Create(rtb));
            encoder.Save(file);

            return file;
        }

    public void CropImageFile(string savePath, string sPhysicalPath, string sOrgFileName, string sThumbNailFileName, ImageFormat oFormat, int targetW, int targetH, int targetX, int targetY)
    {
        try
        {
            Size tsize = new Size(targetW, targetH);
            System.Drawing.Image oImg = System.Drawing.Image.FromFile(sPhysicalPath + @"\" + sOrgFileName);
            System.Drawing.Image oThumbNail = new Bitmap(tsize.Width, tsize.Height, oImg.PixelFormat);
            Graphics oGraphic = Graphics.FromImage(oThumbNail);
            oGraphic.CompositingQuality = CompositingQuality.HighQuality;
            oGraphic.SmoothingMode = SmoothingMode.HighQuality;
            oGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
            oGraphic.DrawImage(oImg, new Rectangle(0, 0, targetW, targetH), targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);
            oThumbNail.Save(savePath + @"\" + sThumbNailFileName, oFormat);
            oGraphic.Dispose();
            oThumbNail.Dispose();

            oImg.Dispose();
            drag.Visible = false;
            ddFiles2.SelectedItem.Text = sThumbNailFileName;
            System.Drawing.Image origImg = System.Drawing.Image.FromFile(Server.MapPath("~/App_Uploads_Img/") + ddCat3.SelectedItem.Text + "/" + sThumbNailFileName);
            divimage.InnerHtml = "<img src=" + epicCMSLib.Navigation.SiteRoot + "App_Uploads_Img/" + ddCat3.SelectedItem.Text + "/" + ddFiles2.SelectedItem.Text + "></img>";
            Label8.Text = "Your selected Image's Width is " + origImg.Width.ToString() + "px and Height is " + origImg.Height.ToString() + "px.";
            Hidden1.Value = origImg.Width.ToString();
            Hidden2.Value = origImg.Height.ToString();
            UpdatePanel3.Update();
            lbSuccess3.ForeColor = System.Drawing.Color.Green;
            lbSuccess3.Text = "Image " + sThumbNailFileName + " created.";
        }
        catch (Exception e1) { errorlabelcrop.ForeColor = System.Drawing.Color.Red;
            errorlabelcrop.Text = e1.Message; }
    }

 public static ImageCodecInfo GetImageEncoder(ImageFormat format)
 {
     return ImageCodecInfo.GetImageEncoders().ToList().Find(delegate(ImageCodecInfo codec)
     {
         return codec.FormatID == format.Guid;
     });
 }

        public static void Save(this BitmapSource image, string filePath, ImageFormat format)
        {
            BitmapEncoder encoder = null;
            
            switch(format)
            {
                case ImageFormat.Png:
                    encoder = new PngBitmapEncoder();
                    break;
                case ImageFormat.Jpeg:
                    encoder = new JpegBitmapEncoder();
                    break;
                case ImageFormat.Bmp:
                    encoder = new BmpBitmapEncoder();
                    break;
            }

            if (encoder == null) 
                return;

            encoder.Frames.Add(BitmapFrame.Create(BitmapFrame.Create(image)));

            using (var stream = new FileStream(filePath, FileMode.Create))
                encoder.Save(stream);
        }

        private static void SaveFromMemory(PixelBuffer[] pixelBuffers, int count, ImageDescription description, Stream imageStream, ImageFormat imageFormat)
        {
            using (var bitmap = new Bitmap(description.Width, description.Height))
            {
                var sourceArea = new Rectangle(0, 0, bitmap.Width, bitmap.Height);

                // Lock System.Drawing.Bitmap
                var bitmapData = bitmap.LockBits(sourceArea, ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

                try
                {
                    // Copy memory
                    if (description.Format == PixelFormat.R8G8B8A8_UNorm || description.Format == PixelFormat.R8G8B8A8_UNorm_SRgb)
                        CopyMemoryBGRA(bitmapData.Scan0, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
                    else if (description.Format == PixelFormat.B8G8R8A8_UNorm || description.Format == PixelFormat.B8G8R8A8_UNorm_SRgb)
                        Utilities.CopyMemory(bitmapData.Scan0, pixelBuffers[0].DataPointer, pixelBuffers[0].BufferStride);
                    else
                        throw new NotSupportedException(string.Format("Pixel format [{0}] is not supported", description.Format));
                }
                finally
                {
                    bitmap.UnlockBits(bitmapData);
                }

                // Save
                bitmap.Save(imageStream, imageFormat);
            }
        }

 public ImageBuilder(int width, int height, ImageFormat format)
 {
     this.width = width;
     this.height = height;
     backend = handler.CreateImageBuilder (width, height, format);
     ctx = new Context (handler.CreateContext (backend));
 }

		public override object CreateImageBuilder (int width, int height, ImageFormat format)
		{
			return new ImageBuilder () {
				Width = width,
				Height = height
			};
		}

		public override object CreateImageBuilder (int width, int height, ImageFormat format)
		{
			var flags = CGBitmapFlags.ByteOrderDefault;
			int bytesPerRow;
			switch (format) {

			case ImageFormat.ARGB32:
				bytesPerRow = width * 4;
				flags |= CGBitmapFlags.PremultipliedFirst;
				break;

			case ImageFormat.RGB24:
				bytesPerRow = width * 3;
				flags |= CGBitmapFlags.None;
				break;

			default:
				throw new NotImplementedException ("ImageFormat: " + format.ToString ());
			}

			var bmp = new CGBitmapContext (IntPtr.Zero, width, height, 8, bytesPerRow, Util.DeviceRGBColorSpace, flags);
			bmp.TranslateCTM (0, height);
			bmp.ScaleCTM (1, -1);
			return new CGContextBackend {
				Context = bmp,
				Size = new CGSize (width, height),
				InverseViewTransform = bmp.GetCTM ().Invert ()
			};
		}

 public static Image FromFile(string fileName, ImageFormat format)
 {
     using (FileStream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
     {
         return FromStream(stream, format);
     }
 }

        /// <summary>
        /// Converts a dot file to the requested image format
        /// </summary>
        /// <param name="dotFilePath">The path to the dot file to convert</param>
        /// <param name="outputFilePath">The file path of where to save the image</param>
        /// <param name="imageFormat">The image format to use when converitng the dot file</param>
        /// <returns>A task representing the asynchronous operation</returns>
        public Task ConvertAsync(string dotFilePath, string outputFilePath, ImageFormat imageFormat)
        {
            if (!File.Exists(dotFilePath))
            {
                throw new ArgumentException("The supplied dot file does not exist", "dotFilePath");
            }

            return Task.Run(() =>
            {
                const int sixtySeconds = 60 * 1000;
                var outputFormat = Enum.GetName(typeof(ImageFormat), (int)imageFormat).ToLower();

                var process = new Process
                {
                    StartInfo = new ProcessStartInfo
                    {
                        Arguments = string.Format(@"-T{0} -o ""{1}"" ""{2}""", outputFormat, outputFilePath, dotFilePath),
                        CreateNoWindow = true,
                        FileName = Path.Combine(_GraphVizBinPath, "dot.exe"),
                        UseShellExecute = false
                    }
                };

                process.Start();
                process.WaitForExit(sixtySeconds);
            });
        }

    public void AddWatermark(string filename, ImageFormat imageFormat, Stream outputStream, HttpContext ctx)
    {
        Image bitmap = Image.FromFile(filename);
        Font font = new Font("Arial", 13, FontStyle.Bold, GraphicsUnit.Pixel);
        Random rnd = new Random();
        Color color = Color.FromArgb(200, rnd.Next(255), rnd.Next(255), rnd.Next(255)); //Adds a black watermark with a low alpha value (almost transparent).
        Point atPoint = new Point(bitmap.Width / 2 - 40, bitmap.Height / 2 - 7); //The pixel point to draw the watermark at (this example puts it at 100, 100 (x, y)).
        SolidBrush brush = new SolidBrush(color);

        string watermarkText = "voobrazi.by";

        Graphics graphics;
        try
        {
            graphics = Graphics.FromImage(bitmap);
        }
        catch
        {
            Image temp = bitmap;
            bitmap = new Bitmap(bitmap.Width, bitmap.Height);
            graphics = Graphics.FromImage(bitmap);
            graphics.DrawImage(temp, new Rectangle(0, 0, bitmap.Width, bitmap.Height), 0, 0, bitmap.Width, bitmap.Height, GraphicsUnit.Pixel);
            temp.Dispose();
        }

        graphics.DrawString(watermarkText, font, brush, atPoint);
        graphics.Dispose();

        bitmap.Save(outputStream, imageFormat);
        bitmap.Dispose();
    }

 private void GenerateImage(
     HttpResponse response,
     string textToInsert,
     int width,
     int height,
     Color backgroundColor,
     FontFamily fontFamily,
     float emSize,
     Brush brush,
     float x,
     float y,
     string contentType,
     ImageFormat imageFormat)
 {
     using (Bitmap bitmap = new Bitmap(width, height))
     {
         using (Graphics graphics = Graphics.FromImage(bitmap))
         {
             graphics.Clear(backgroundColor);
             graphics.DrawString(textToInsert, new Font(fontFamily, emSize), brush, x, y);
             response.ContentType = contentType;
             bitmap.Save(response.OutputStream, imageFormat);
         }
     }
 }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="index"></param>
        /// <param name="outputFileName"></param>
        /// <param name="outputformat"></param>
        public void ChartToImage(int index, string outputFileName, ImageFormat outputformat)
        {
            try
            {
                //check whether file is set or not
                if (FileName == "")
                    throw new Exception("No file name specified");
                else if (WorksheetName == "")
                    throw new Exception("No Worksheet name specified");

                //build URI
                string strURI = Aspose.Cloud.Common.Product.BaseProductUri + "/cells/" + FileName;
                strURI += "/worksheets/" + WorksheetName + "/charts/" + index + "?format=" + outputformat;

                //sign URI
                string signedURI = Utils.Sign(strURI);

                //get response stream
                Stream responseStream = Utils.ProcessCommand(signedURI, "GET");

                using (Stream fileStream = System.IO.File.OpenWrite(outputFileName))
                {
                    Utils.CopyStream(responseStream, fileStream);
                }

                responseStream.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

        }