private static void ResizeAndPreserveMetadata()
{
using (var jpegReader = new JpegReader("../../../../_Input/Chicago.jpg"))
using (var resizer = new Resize(jpegReader.Width / 2, 0))
using (var jpegWriter = new JpegWriter("../../../../_Output/ResizeAndPreserveMetadata.jpg"))
{
// Read EXIF
var exif = jpegReader.Exif;
// Check if loaded image contains EXIF metadata
if (exif == null)
{
exif = new ExifDictionary();
}
exif[ExifDictionary.Software] = "Aurigma Graphics Mill";
// Read IPTC
var iptc = jpegReader.Iptc;
// Check if loaded image contains IPTC metadata
if (iptc == null)
{
iptc = new IptcDictionary();
}
iptc[IptcDictionary.Keyword] = "mountain";
// Read Adobe resource blocks
var adobeResources = jpegReader.AdobeResources;
// Check if loaded image contains Adobe image resource blocks
if (adobeResources == null)
{
adobeResources = new AdobeResourceDictionary();
}
// Create new adobe image resource block containing copyright metadata
var arBlock = new AdobeResourceBlock("Copyright", new byte[] { 1 });
// Set this block to the item with 0x040A ID (copyright flag)
adobeResources[0x040A] = arBlock;
// Read XMP
var xmp = new XmpData();
//Check if loaded image contains XMP metadata
if (jpegReader.Xmp != null)
{
xmp.Load(jpegReader.Xmp);
}
// Create a node containing dc:contributor metadata
var node = new XmpValueNode(XmpNodeType.SimpleProperty, "John Doe", XmpTagNames.DCContributor);
xmp.AddNode(node);
// Write metadata
jpegWriter.Exif = exif;
jpegWriter.Iptc = iptc;
jpegWriter.AdobeResources = adobeResources;
jpegWriter.Xmp = xmp.Save();
Pipeline.Run(jpegReader + resizer + jpegWriter);
}
}
/// <summary>
/// Updates metdata of JPEG image without recompression
/// </summary>
private static void UpdateJpegMetadataLosslessly()
{
using (var losslessJpeg = new LosslessJpeg("../../../../_Input/Chicago.jpg"))
{
// IPTC
if (losslessJpeg.Iptc == null)
{
losslessJpeg.Iptc = new IptcDictionary();
}
losslessJpeg.Iptc[IptcDictionary.Caption] = "Mountain";
// EXIF
if (losslessJpeg.Exif == null)
{
losslessJpeg.Exif = new ExifDictionary();
}
losslessJpeg.Exif[ExifDictionary.Software] = "Aurigma Graphics Mill";
// XMP
var xmp = new XmpData();
if (losslessJpeg.Xmp != null)
{
xmp.Load(losslessJpeg.Xmp);
}
var node = new XmpValueNode(XmpNodeType.SimpleProperty, "John Doe", XmpTagNames.DCContributor);
xmp.AddNode(node);
losslessJpeg.Xmp = xmp.Save();
// Adobe image resource blocks
if (losslessJpeg.AdobeResources == null)
{
losslessJpeg.AdobeResources = new AdobeResourceDictionary();
}
const int copyrightFlag = 0x040A;
var arBlock = new AdobeResourceBlock("Copyright", new byte[] { 1 });
losslessJpeg.AdobeResources[copyrightFlag] = arBlock;
losslessJpeg.Write("../../../../_Output/UpdateJpegMetadataLosslessly.jpg");
}
}
/// <summary>
/// Write copyright XMP block
/// </summary>
private static void WriteAdobeResourceBlock(string inputPath, string outputPath)
{
using (var reader = new JpegReader(inputPath))
using (var writer = new JpegWriter(outputPath))
{
var adobeResources = reader.AdobeResources;
if (adobeResources == null)
{
adobeResources = new AdobeResourceDictionary();
}
// Create new adobe image resource block with the required metadata
var arBlock = new AdobeResourceBlock("Copyright", new byte[] { 1 });
// Set this block to the item with 0x040A ID (copyright flag)
adobeResources[0x040A] = arBlock;
// Remove a block with 0x0409 (thumbnail data)
adobeResources.Remove(0x0409);
writer.AdobeResources = adobeResources;
Pipeline.Run(reader + writer);
}
}