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【CSharp】 Tiff转换Bitmap

作者:彦 / 发布于2016/1/11/ 1637


	首先项目中引入BitMiracle.LibTiff.NET的dll
	命名空间：
	using BitMiracle.LibTiff.Classic;
	using System.Runtime.InteropServices;
	using System.Windows.Forms;
	
	private static Bitmap TiffToBitmap(string asTiffFile)
	 {
	 Bitmap bmp = null;
	 try
	 {
	 bmp = (Bitmap)Bitmap.FromFile(asTiffFile);
	 return bmp;
	 }
	 catch
	 {
	 }
	 Tiff tif = Tiff.Open(asTiffFile, "r");
	 if (tif == null)
	 {
	 return null;
	 }
	 // Find the width and height of the image
	 FieldValue[] value = tif.GetField(TiffTag.IMAGEWIDTH);
	 int width = value[0].ToInt();
	 value = tif.GetField(TiffTag.IMAGELENGTH);
	 int height = value[0].ToInt();
	 // Read the image into the memory buffer
	 int[] raster = new int[height * width];
	 if (!tif.ReadRGBAImage(width, height, raster))
	 {
	 tif.Close();
	 tif.Dispose();
	 return null;
	 }
	 tif.Close();
	 tif.Dispose();
	 // bitmap作成
	 bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
	 Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
	 BitmapData bmpdata = bmp.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
	 byte[] bits = new byte[bmpdata.Stride * bmpdata.Height];
	 for (int y = 0; y < bmp.Height; y++)
	 {
	 int rasterOffset = y * bmp.Width;
	 int bitsOffset = (bmp.Height - y - 1) * bmpdata.Stride;
	 for (int x = 0; x < bmp.Width; x++)
	 {
	 int rgba = raster[rasterOffset++];
	 bits[bitsOffset++] = (byte)((rgba >> 16) & 0xff);
	 bits[bitsOffset++] = (byte)((rgba >> 8) & 0xff);
	 bits[bitsOffset++] = (byte)(rgba & 0xff);
	 }
	 }
	 Marshal.Copy(bits, 0, bmpdata.Scan0, bits.Length);
	 bmp.UnlockBits(bmpdata);
	 return bmp;
	 }
	使用方法：
	Bitmap oBmp = TiffToBitmap(asFileName);

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