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'For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
' initialize PngFormat
Dim PngFormat As New PngFormat(Common.MapSourceFilePath(filePath))

' get access to CameraRaw schema
Dim package = PngFormat.XmpValues.Schemes.CameraRaw

' update properties
package.AutoBrightness = True
package.AutoContrast = True
package.CropUnits = CropUnits.Pixels

' update white balance
package.SetWhiteBalance(WhiteBalance.Auto)

' commit changes
PngFormat.Save(Common.MapDestinationFilePath(filePath))