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  • 生成缩略图

    private void SaveThumbnail(Bitmap originBitmap, int width, int height, string directory, string filename, string extension)
    {
        var physicalPath = directory + filename + extension;
                
        using (var newImage = new Bitmap(width, height))
        {
            using (var graphic = GetGraphic(originBitmap, newImage))
            {
                graphic.DrawImage(originBitmap, 0, 0, width, height);
                using (var encoderParameters = new EncoderParameters(1))
                {
                    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
                    newImage.Save(physicalPath,
                                ImageCodecInfo.GetImageEncoders()
                                    .Where(x => x.FilenameExtension.Contains(extension.ToUpperInvariant()))
                                    .FirstOrDefault(),
                                encoderParameters);
                }
            }
        }            
    }
    
    private Graphics GetGraphic(Image originImage, Bitmap newImage)
    {
        newImage.SetResolution(originImage.HorizontalResolution, originImage.VerticalResolution);
        var graphic = Graphics.FromImage(newImage);
        graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        graphic.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
        graphic.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        return graphic;
    }
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  • 原文地址:https://www.cnblogs.com/amylis_chen/p/3041664.html
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