public static void SaveGIF(this Image img, Stream stream, GIFQuality quality)
{
if (quality == GIFQuality.Default)
{
img.Save(stream, ImageFormat.Gif);
}
else
{
Quantizer quantizer;
switch (quality)
{
case GIFQuality.Grayscale:
quantizer = new GrayscaleQuantizer();
break;
case GIFQuality.Bit4:
quantizer = new OctreeQuantizer(15, 4);
break;
case GIFQuality.Bit8:
default:
quantizer = new OctreeQuantizer(255, 4);
break;
}
using (Bitmap quantized = quantizer.Quantize(img))
{
quantized.Save(stream, ImageFormat.Gif);
}
}
}
public MemoryStream Resize()
{
//salva su memorystream un'immagine ridimensionandola
if (rImage == null)
{
throw new System.ApplicationException("Image not loaded!");
}
MemoryStream memorystream = new MemoryStream();
ByteSize = 0;
try
{
System.Drawing.Image thumbnail = new Bitmap(thumbWidth, thumbHeight);
System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(thumbnail);
if (HighQuality)
{
graphic.InterpolationMode = Filter;
graphic.SmoothingMode = SmoothingMode.HighQuality;
graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
graphic.CompositingQuality = CompositingQuality.HighQuality;
}
else
{
graphic.InterpolationMode = InterpolationMode.Low;
graphic.SmoothingMode = SmoothingMode.HighSpeed;
graphic.PixelOffsetMode = PixelOffsetMode.HighSpeed;
graphic.CompositingQuality = CompositingQuality.HighSpeed;
}
graphic.DrawImage(rImage, 0, 0, thumbWidth, thumbHeight);
/* EVENTUALI OPERAZIONI SULL'IMMAGINE QUI... */
EncoderParameters encoderParameters;
encoderParameters = new EncoderParameters(1);
ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
switch (FileType)
{
case "gif": // info[2]
if (GifDepth != 0)
{
/* VERSIONE PER ASP
* Quantizer quantizer = new OctreeQuantizer(GifPalette, GifDepth);
* using (Bitmap quantized = quantizer.Quantize(thumbnail))
* { quantized.Save(memorystream, ImageFormat.Gif); }*/
/* VERSIONE GENERALE */
Quantizer quantizer;
if (GifDepth == 255)
{
quantizer = new GrayscaleQuantizer();
}
else
{
quantizer = new OctreeQuantizer(GifPalette, GifDepth);
}
using (Bitmap quantized = quantizer.Quantize(thumbnail))
{ quantized.Save(memorystream, ImageFormat.Gif); }
}
else
{
thumbnail.Save(memorystream, System.Drawing.Imaging.ImageFormat.Gif);
}
break;
case "png": // info[4]
thumbnail.Save(memorystream, System.Drawing.Imaging.ImageFormat.Png);
break;
case "bmp": // info[0]
thumbnail.Save(memorystream, System.Drawing.Imaging.ImageFormat.Bmp);
break;
case "tiff": // info[3]
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, TiffCompress ? (long)EncoderValue.CompressionLZW : (long)EncoderValue.CompressionNone);
thumbnail.Save(memorystream, info[3], encoderParameters);
break;
default: //jpeg info[1]
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, JpegQuality);
thumbnail.Save(memorystream, info[1], encoderParameters);
break;
}
ByteSize = memorystream.Length;
graphic.Dispose();
graphic = null;
thumbnail.Dispose();
thumbnail = null;
}
catch
{
throw new System.ApplicationException("Unable to resize the image");
}
return(memorystream);
}
