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//For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
// initialize PngFormat
PngFormat PngFormat = new PngFormat(Common.MapSourceFilePath(filePath));

// get access to CameraRaw schema
var 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));