将任何图像格式转换为JPG

Question

I have a web app that runs on Azure. The user can upload an image and I save that image for them. Now when I receive the image, I have it as byte[] . I would like to save it as JPG to save space. The source image could be anything such as PNG, BMP or JPG.

Is it possible to do so? This needs to run on Azure and I am using WebApps/MVC5/C#.

Thanks for any help.

Answer 1

So the answers by @mjwills and Cody was correct. I still thought to put the two methods I exactly needed:

    public static Image BitmapToBytes(byte[] image, ImageFormat pFormat)
    {
        var imageObject = new Bitmap(new MemoryStream(image));

        var stream = new MemoryStream();
        imageObject.Save(stream, pFormat);

        return new Bitmap(stream);
    }

Also:

    public static byte[] ImgToByteArray(Image img)
    {
        using (MemoryStream mStream = new MemoryStream())
        {
            img.Save(mStream, img.RawFormat);
            return mStream.ToArray();
        }
    }

Cheers everyone.

Answer 2

Get the memorystream and then use System.Drawing

var stream = new MemoryStream(byteArray)
Image img =  new Bitmap(stream);
img.Save(@"c:\s\pic.png", System.Drawing.Imaging.ImageFormat.Png);

The last line there where you save the file, you can select the format.