/// <summary>
/// Crops JPEG image losslessly
/// </summary>
private static void CropJpegLosslessly()
{
using (var losslessJpeg = new LosslessJpeg("../../../../_Input/Chicago.jpg"))
{
losslessJpeg.WriteCropped("../../../../_Output/CropJpegLosslessly.jpg",
new System.Drawing.Rectangle(64, 40, 157, 117));
}
}
/// <summary>
/// Flips JPEG image losslessly
/// </summary>
private static void FlipJpegLosslessly()
{
using (var losslessJpeg = new LosslessJpeg("../../../../_Input/Chicago.jpg"))
{
losslessJpeg.WriteRotated("../../../../_Output/FlipJpegLosslessly.jpg",
System.Drawing.RotateFlipType.RotateNoneFlipX);
}
}
private static void RotateJpegWithRecompression(string pathIn, string pathOut, uint orientation)
{
using (var losslessJpeg = new LosslessJpeg(pathIn))
{
System.Drawing.RotateFlipType flipType;
switch (orientation)
{
case 2:
flipType = System.Drawing.RotateFlipType.RotateNoneFlipX;
break;
case 3:
flipType = System.Drawing.RotateFlipType.Rotate180FlipNone;
break;
case 4:
flipType = System.Drawing.RotateFlipType.Rotate180FlipX;
break;
case 5:
flipType = System.Drawing.RotateFlipType.Rotate90FlipX;
break;
case 6:
flipType = System.Drawing.RotateFlipType.Rotate90FlipNone;
break;
case 7:
flipType = System.Drawing.RotateFlipType.Rotate270FlipX;
break;
case 8:
flipType = System.Drawing.RotateFlipType.Rotate270FlipNone;
break;
default:
flipType = System.Drawing.RotateFlipType.RotateNoneFlipNone;
break;
}
losslessJpeg.Exif[ExifDictionary.Orientation] = 1;
losslessJpeg.WriteRotated(pathOut, flipType);
}
}
/// <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>
/// Applies mosaic effect on region of image with partial JPEG recompression
/// </summary>
private static void RecompressJpegPartially()
{
var rect = new System.Drawing.Rectangle(264, 192, 264, 184);
using (var patchBitmap = new Bitmap())
{
// Apply crop and mosaic transfroms
using (var reader = ImageReader.Create("../../../../_Input/Chicago.jpg"))
using (var crop = new Crop(rect))
using (var mosaic = new Mosaic(10, 10))
{
Pipeline.Run(reader + crop + mosaic + patchBitmap);
}
// Patch JPEG
using (var losslessJpeg = new LosslessJpeg("../../../../_Input/Chicago.jpg"))
{
rect = losslessJpeg.AlignToMCUSize(rect, JpegAlignToSampleSizeMode.Patch);
losslessJpeg.WritePatched("../../../../_Output/ResompressJpegPartially.jpg", rect.Location, patchBitmap);
}
}
}
