调整大小后，ImageProcessor似乎将图像旋转了90度

Question

I downloaded the ImageProcessor library using nuget for c#. I am using it to upload and resize image for a website. The upload process works fine except, when I try to view the uploaded image it appears backward rotated 90 from the original image. Here is the code that I am using:

        ISupportedImageFormat format = new JpegFormat { Quality = 70 };

        using (MemoryStream inStream = new MemoryStream(_img))
        {
            using (MemoryStream outStream = new MemoryStream())
            {
                // Initialize the ImageFactory using the overload to preserve EXIF metadata.
                using (ImageFactory imageFactory = new ImageFactory(preserveExifData: false))
                {
                    // Load, resize, set the format and quality and save an image.
                    imageFactory.Load(inStream)
                        .Resize(new ResizeLayer(new Size(width, height), resizeMode: resizeMode))
                                .Format(format)
                                .Save(outStream);
                }

                return outStream.ToArray();
            }
        }

Answer 1

If you are not preserving EXIF metadata the ImageFactory class has a method AutoRotate that will alter the image to compensate for the original orientation.

http://imageprocessor.org/imageprocessor/imagefactory/autorotate/

Your new code would be as follows.

ISupportedImageFormat format = new JpegFormat { Quality = 70 };

using (MemoryStream inStream = new MemoryStream(_img))
{
    using (MemoryStream outStream = new MemoryStream())
    {
        // Initialize the ImageFactory using the overload to preserve EXIF metadata.
        using (ImageFactory imageFactory = new ImageFactory(preserveExifData: false))
        {
            // Load, resize, set the format and quality and save an image.
            imageFactory.Load(inStream)
                        .AutoRotate()
                        .Resize(new ResizeLayer(new Size(width, height), resizeMode: resizeMode))
                        .Format(format)
                        .Save(outStream);
        }

        return outStream.ToArray();
    }
}