[UWP]如何获取所有相机/ exif /照片元数据？ [英] [UWP]How to get all camera/ exif /photo metadata?

问题描述

我需要获取拍摄照片的所有元数据或拍摄照片之前，如亮度，iso速度，f值，对比度等。

现在我用照片拍照; CapturePhotoToStorageFileAsync（ImageEncodingProperties.CreateJpeg（），photoFile）但在保存的jpg文件中没有获取元数据。

在拍照时还尝试将SoftwareBitmap作为其BitmapPropertySet，但只有相机制造商和型号元数据。

解决方案

你好，

您可以使用 GetImagePropertiesAsync
获取图像特殊属性的方法。要访问大量文件元数据，可以使用Windows Property System，这是一组可以使用唯一字符串标识符检索的文件元数据属性。

 private async Task< IDictionary< string，object>> GetImageProperties（StorageFile imageFile）
 {
 ImageProperties props = await imageFile.Properties.GetImagePropertiesAsync（）; 
 
 var requests = new System.Collections.Generic.List< string>（）; 
 requests.Add（" System.Photo.Orientation"）; 
 requests.Add（" System.Photo.Aperture"）; 
 requests.Add（" System.Photo.ISOSpeed"）; 
 requests.Add（" System.Photo.Brightness"）; 
 requests.Add（" System.Photo.Contrast"）; 
 
 IDictionary< string，object> retrieveProps = await props.RetrievePropertiesAsync（requests）; 
 
返回retrieveProps; 
} 

有关更多图片特殊属性，请参阅此
部分。

处理图片数据的最高级方法是使用  BitmapDecoder 。
这个
文章显示了如何阅读Image MetaData。

祝你好运，

罗伊

I need get all metadata of captured photo or before capturing photo, like brightness, iso speed, f-number, contrast and others.

Now I take photo using CapturePhotoToStorageFileAsync(ImageEncodingProperties.CreateJpeg(), photoFile) but get no metadata in saved jpg file.

Also tried get SoftwareBitmap an its BitmapPropertySet when taking photo but there was only camera manufacturer and model metadata.

解决方案

Hello ,

You can use GetImagePropertiesAsync method to get image-special properties. To access a large set of file metadata, you can use the Windows Property System, a set of file metadata properties that can be retrieved with a unique string identifier.

        private async Task<IDictionary<string, object>> GetImageProperties(StorageFile imageFile)
        {
            ImageProperties props = await imageFile.Properties.GetImagePropertiesAsync();

            var requests = new System.Collections.Generic.List<string>();
            requests.Add("System.Photo.Orientation");
            requests.Add("System.Photo.Aperture");
            requests.Add("System.Photo.ISOSpeed");
            requests.Add("System.Photo.Brightness");
            requests.Add("System.Photo.Contrast");

            IDictionary<string, object> retrievedProps = await props.RetrievePropertiesAsync(requests);

            return retrievedProps;
        }

For more image-special properties, you can refer to this section.

The most advanced way of working with image data is to read the properties on the stream level using a BitmapDecoder. This article shows how to read Image MetaData.

Best regards,

Roy

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