如何使用 JpegBitmapEncoder 保存图像 [英] How to save image using JpegBitmapEncoder

问题描述

根据图像编码示例这里能够使用 JpegBitmapEncoder 来编码一个保存为 jpeg 文件的图像，但出现此编译错误:

According to the image encoding example here I should be able to use JpegBitmapEncoder to encode an image for saving as a jpeg file but get this compile error:

错误 CS1503:参数 1:无法从System.Windows.Controls.Image"转换为System.Uri"

我没有看到从 Image 中获取 System.Uri 的方法(Image 中的属性或方法).我错过了什么?

I don't see a way (property or method in Image) to get System.Uri from Image. What am I missing?

Image xaml 代码是

The Image xaml code is

<Image Name="ColorImage"/>

SaveImage C# 是

The SaveImage C# is

...
SaveImage(ColorImage, path);
...
private void SaveImage(Image image, string path)
{
    var jpegEncoder = new JpegBitmapEncoder();
    jpegEncoder.Frames.Add(BitmapFrame.Create(image));
    using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
    {
        jpegEncoder.Save(fs);
    }
}

下面的代码(主要取自 kinect-sdk)将 640 x 480 RBG 流式传输到 WriteableBitmap 在 30 Fps(kinect ColorImageFormat 是 RgbResolution640x480Fps30).

The code below (taken mostly from the kinect-sdk) streams 640 x 480 RBG to a WriteableBitmap at 30 Fps (the kinect ColorImageFormat is RgbResolution640x480Fps30).

using (var colorImageFrame = allFramesReadyEventArgs.OpenColorImageFrame())
{
    if (colorImageFrame == null) return;
    var haveNewFormat = currentColorImageFormat != colorImageFrame.Format;
    if (haveNewFormat)
    {
        currentColorImageFormat = colorImageFrame.Format;
        colorImageData = new byte[colorImageFrame.PixelDataLength];
        colorImageWritableBitmap = new WriteableBitmap(
            colorImageFrame.Width, 
            colorImageFrame.Height, 96, 96, PixelFormats.Bgr32, null);
        ColorImage.Source = colorImageWritableBitmap;
    }
    // Make a copy of the color frame for displaying.
    colorImageFrame.CopyPixelDataTo(colorImageData);
    colorImageWritableBitmap.WritePixels(
        new Int32Rect(0, 0, colorImageFrame.Width, colorImageFrame.Height),
        colorImageData,
        colorImageFrame.Width*Bgr32BytesPerPixel,
        0);
}

推荐答案

private void SaveImage(string path)
{
    var jpegEncoder = new JpegBitmapEncoder();
    jpegEncoder.Frames.Add(BitmapFrame.Create(colorImageWritableBitmap));
    using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
    {
        jpegEncoder.Save(fs);
    }
}

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