2

大家好，我正在研究 webapi，我需要优化文件夹中的图像， Uploaded images into one folder然后再上传到destination folder我需要减少image size in KB总图像的数量，我正在优化一个single image in to 3 different sizes' (large, thumbnail,medium)' but image sizes are increased并保存在一个文件夹中，现在我需要优化这些图像，你可以请帮助我，我该怎么做。实际上我是 webapi 的新手。任何人都可能有任何想法，请帮助我，但我需要做一件事，this manually 谢谢你

这是我的控制器

public Task<HttpResponseMessage> Post()
        {
            if (!Request.Content.IsMimeMultipartContent("form-data"))
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }

            var uploadFolder = HostingEnvironment.MapPath("~/App_Sprites/UploadFolder");
            uploadFolder = Path.Combine(uploadFolder, DateTime.Now.ToString("yyyyMMddhhmmssfff"));
            Directory.CreateDirectory(uploadFolder);
            var streamProvider = new PreserveFilenameMultipartFileStreamProvider(uploadFolder);

            return Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>
            {
                foreach (var uploadedFile in Directory.GetFiles(uploadFolder))
                {
                    var thumbnail = Path.Combine(uploadFolder, "thumb-" + Path.GetFileName(uploadedFile));
                    var medium = Path.Combine(uploadFolder, "medium-" + Path.GetFileName(uploadedFile));
                    var large = Path.Combine(uploadFolder, "large-" + Path.GetFileName(uploadedFile));
                    ImageTools.Resize(uploadedFile, thumbnail, 80, 80);
                    ImageTools.Resize(uploadedFile, medium, 48, 48);
                    ImageTools.Resize(uploadedFile, large, 128, 128);
                }
                return Request.CreateResponse(HttpStatusCode.Accepted);
            });
        }
    }

abd 这是我的课程文件

 public class ImageTools
    {
        public static void Resize(string original, string output, int width, int height)
        {
            using (var image = Image.FromFile(original))
            using (var thumbnail = new Bitmap(width, height))
            using (var graphics = Graphics.FromImage(thumbnail))
            {
                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                graphics.SmoothingMode = SmoothingMode.HighQuality;
                graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                graphics.CompositingQuality = CompositingQuality.HighQuality;

                graphics.DrawImage(image, 0, 0, width, height);

                ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
                EncoderParameters encoderParameters;
                encoderParameters = new EncoderParameters(1);
                encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
                thumbnail.Save(output, info[1], encoderParameters);
            }
        }
    }

类文件

 public class PreserveFilenameMultipartFileStreamProvider : MultipartFileStreamProvider
        {
            public PreserveFilenameMultipartFileStreamProvider(string rootPath)
                : base(rootPath)
            {
            }

            public override string GetLocalFileName(HttpContentHeaders headers)
            {
                return headers.ContentDisposition.FileName.Replace("\"", "");
            }
        }

这是我的布局页面

@using (Html.BeginRouteForm("DefaultApi", new { httproute = "", controller = "Upload" }, FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="image" multiple="multiple" accept="image/*" />
    <button type="submit">Upload</button>
}

我创建了一个文件夹，现在图像保存在文件夹中，但文件大小以 kb 为单位增加，但我们需要减少，请帮助我

4

2 回答 2

3

您应该为 QualityLevel 的Resize方法添加一个参数，并使用此参数更改不同的渲染。

您正在调整质量设置为完整的图像大小，这不是很有效。

您应该尝试指定另一种文件格式，我不知道您使用的是哪种文件格式，但.PNG用于小图像，.JPG用于更大的图像应该会有所帮助。（如果你真的需要那个额外的字节，也可以使用.GIF）

在使用图像之前应该进行一些图像处理，但我想你在这里没有选择。

于 2012-09-26T10:00:54.820 回答
2

如上所述，您的问题需要做一些小改动，试试这个，只需在您的控制器中调用此文件，我希望它对您有所帮助 

 public class ImageDecrease
        {
            public static void Resize(Stream original, string output, int width, int height)
            {
                using (var image = Image.FromStream(original))
                using (var thumbnail = new Bitmap(width, height))
                using (var graphics = Graphics.FromImage(thumbnail))
                {
                    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    graphics.SmoothingMode = SmoothingMode.HighQuality;
                    graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    graphics.CompositingQuality = CompositingQuality.HighQuality;

                    graphics.DrawImage(image, 0, 0, width, height);

                    ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
                    EncoderParameters encoderParameters;
                    encoderParameters = new EncoderParameters(1);
                    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
                    thumbnail.Save(output, info[1], encoderParameters);
                }
            }
        }
于 2012-09-27T09:20:06.643 回答